You are developing an app that will read activity logs for an Azure subscription by using Azure Functions. You need to recommend an authentication solution for ...

You are developing an app that will read activity logs for an Azure subscription by using Azure Functions.
You need to recommend an authentication solution for Azure Functions. The solution must minimize administrative effort.
What should you include in the recommendation?

A. an enterprise application in Azure AD B. system-assigned managed identities C. shared access signatures (SAS) D. application registration in Azure AD