You have an Azure subscription.

You have 100 Azure virtual machines.

You need to quickly identify underutilized virtual machines that can have their service tier changed to a less expensive offering.

Which blade should you use?

A. Metrics
B. Customer sights
C. Monitor

D. Advisor

Explanation:
Advisor helps you optimize and reduce your overall Azure spend by identifying idle and underutilized resources. You can get cost recommendations from the Cost tab on the Advisor dashboard.

Reference:
https://docs.microsoft.com/en-us/azure/advisor/advisor-cost-recommendations