How many Appl instances should you identify?

Your company purchases an app named App1.

You plan to tun App1 on seven Azure virtual machines In an Availability Set. The number of fault domains is set to 3. The number of update domains is set to 20.

You need to identity how many App1 instances will remain available during a period of planned maintenance.

How many Appl instances should you identify?
A . 1
B . 2
C . 6
D . 7

Answer: C

Explanation:

Only one update domain is rebooted at a time. Here there are 7 update domain with one VM each (and 13 update domain with no VM).

Reference: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability