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.
• Attach an additional network interface.

Which change will cause downtime for VM1?

A. Add the Puppet Agent extension.

B. Change the size to D8s v3.

C. Add a 500-GB managed disk.
D. Attach an additional network interface.

Explanation:
While resizing the VM it must be in a stopped state.

References:
https://azure.microsoft.com/en-us/blog/resize-virtual-machines/