When designing the technical solution for a disaster recovery site, the PRIMARY factor that should
be taken into consideration is the:

A.
services delivery objective.

B.
recovery time objective (RTO).

C.
recovery window.

D.
maximum tolerable outage (MTO).

Explanation:

The length of the recovery window is defined by business management and determines the
acceptable time frame between a disaster and the restoration of critical services/applications. The
technical implementation of the disaster recovery (DR) site will be based on this constraint,
especially the choice between a hot, warm or cold site. The service delivery objective is supported
during the alternate process mode until the normal situation is restored, which is directly related to
business needs. The recovery time objective (RTO) is commonly agreed to be the time frame
between a disaster and the return to normal operations. It is then longer than the interruption
window and is very difficult to estimate in advance. The time frame between the reduced operation
mode at the end of the interruption window and the return to normal operations depends on the

magnitude of the disaster. Technical disaster recovery solutions alone will not be used for
returning to normal operations. Maximum tolerable outage (MTO) is the maximum time acceptable
by a company operating in reduced mode before experiencing losses. Theoretically, recovery time
objectives (RTOs) equal the interruption window plus the maximum tolerable outage. This will not
be the primary factor for the choice of the technical disaster recovery solution.