Your company has a datacenter in Los Angeles. The datacenter contains a server named VMM1 that
has System Center 2012 Virtual Machine Manager (VMM) installed. You plan to deploy a service
named SRV1. SRV1 will contain three tiers. Each tier will contain 8 instances. You need to configure
the service template to ensure that when an application in SRV1 is upgraded, SRV1 remains
available. What should you configure for each tier?

A.
the maximum instance count

B.
the preferred deployment order

C.
the number of upgrade domains

D.
the minimum instance count

E.
the preferred servicing order

Explanation:
http://technet.microsoft.com/en-us/library/gg675089.aspx
To minimize service interruptions when a tier is updated in-place, you can specify more than one
upgrade domain in the tier properties. When the tier is updated, VMM updates the virtual machines
in the tier according to the upgrade domain to which they belong. VMM upgrades one upgrade
domain at a time, shutting down the virtual machines running within the upgrade domain, updating
them, bringing them back online, and then moving on to the next upgrade domain. By shutting down
only the virtual machines running within the current upgrade domain, VMM ensures that an upgrade
takes place with the least possible impact to the running service.