Different threats need to be evaluated and ranked based upon their severity of business risk when developing a BCP. Which ranking approach is illustrated in the graphic that follows?
Choose the following statement that best describes the effect on this business unit/cost center should there be an unplanned interruption of normal business operations.

8 hours of an interruption. This business unit/cost center is Vital.
24 hours of an interruption. This business unit/cost center is Critical.
3 days of an interruption. This business unit/cost center is Essential.
5 days of an interruption. This business unit/cost center is Important.
10 days of an interruption. This business unit/cost center is Noncritical.
30 days of an interruption. This business unit/cost center is Deferrable.

A.
Mean time to repair

B.
Mean time between failures

C.
Maximum critical downtime

D.
Maximum tolerable downtime

Explanation:
D: The BIA identifies which of the company’s critical systems are needed for survival and estimates the outage time that can be tolerated by the company as a result of various
unfortunate events. The outage time that can be endured by a company is referred to as the maximum tolerable downtime (MTD). This is the time frame between an unplanned
interruption of business operations and the resumption of business at a reduced level of service. During the BIA, the BCP team identifies the maximum tolerable downtime for the
critical resources. This was done to understand the business impact that would be caused if the assets were unavailable for one reason or another.
A is incorrect because the mean time to repair (MTTR) is the amount of time it will be expected to take to get a device fixed and back into production. For a hard drive in a redundant
array, the MTTR is the amount of time between the actual failure and the time when, after noticing the failure, someone has replaced the failed drive and the redundant array has
completed rewriting the information on the new drive. This is likely to be measured in hours. For an unplanned reboot, the MTTR is the amount of time between the failure of the
system and the point in time when it has rebooted its operating system, checked the state of its disks (hopefully finding nothing that its file systems cannot handle), restarted its
applications, allowed its applications to check the consistency of their data (hopefully finding nothing that their journals cannot handle), and once again begun processing transactions.
For well-built hardware running high-quality, well-managed operating systems and software, this may be only minutes. For commodity equipment without high-performance journaling
file systems and databases, this may be hours, or, worse, days if automated recovery/rollback does not work and a restore of data from tape is required.
B is incorrect because the mean time between failures (MTBF) is the estimated lifespan of a piece of equipment. MTBF is calculated by the vendor of the equipment or a third party.
The reason for using this value is to know approximately when a particular device will need to be replaced. Either based on historical data or scientifically estimated by vendors, it is
used as a benchmark for reliability by predicting the average time that will pass in the operation of a component or a system until its final death. Organizations trending MTBF over time
for the device they use may be able to identify types of devices that are failing above the averages promised by manufacturers and take action such as proactively contacting
manufacturers under warranty, or deciding that old devices are reaching the end of their useful life and choosing to replace them en masse before larger-scale failures and operational
disruptions occur.
C is incorrect because maximum critical downtime is not an official term used in BCP and is a distracter answer.