Which two technologies should you recommend?

A company plans to use third-party application software to perform complex data analysis processes. The software will use up to 500 identical virtual machines (VMs) based on an Azure Marketplace VM image.

You need to design the infrastructure for the third-party application server. The solution must meet the following requirements:

* The number of VMs that are running at any given point in time must change when the user workload changes.

* When a new version of the application is available in Azure Marketplace it must be deployed without causing application downtime.

* Use VM scale sets.

* Minimize the need for ongoing maintenance.

Which two technologies should you recommend? Each correct answer presents part of the solution.

NOTE: Each correct selection is worth one point.
A . single placement group
B . single storage account
C . managed disks
D . autoscale