A company wants to make use of an Azure service that can be used to store certificates. Which of the following could be used for storing certificates?

Answer options:

A.Azure Security Center
B.Azure Storage Account
C.Azure Key Vault
D.Azure Identity Protection

Answer – C 
You can store certificates in the Azure Key Vault service. 
The Microsoft documentation mentions the following. 

Option A is incorrect since this is used to increase the security posture of your resources defined in Azure. 
Option B is incorrect since this is used for object, file, table and queue storage. 
Option D is incorrect since this is used to protect Azure AD identities. 
For more information on the Azure Key vault service, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/key-vault/key-vault-overview