You have an Azure subscription that contains a virtual machine named VM1. VM1 hosts a line-of-business application that is available 24 hours a day. VM1 has one network interface and one managed disk. VM1 uses the D4s v3 size. You plan to make the following changes to VM1: ✑ Change the size to D8s v3. ✑ Add a 500-GB managed disk. ✑ Add the Puppet Agent extension. ✑ Enable Desired State Configuration Management. Which change will cause downtime for VM1? 

Answer options:

A. Enable Desired State Configuration Management
B. Add a 500-GB managed disk
C. Change the size to D8s v3
D. Add the Puppet Agent extension

C

While resizing the VM it must be in a stopped state. Reference: https://azure.microsoft.com/en-us/blog/resize-virtual-machines/