Answer: Two update domains

The correct answer is D. Two update domains should be included in the Availability Set. Update domains ensure that not all VMs are rebooted at the same time during planned maintenance. During such events, only one update domain is affected at a time, which ensures that at least one VM remains available. This helps maintain the availability of App1 even when updates or maintenance tasks are performed on the hosting hardware.

Author: LeetQuiz Editorial Team