You have an Azure subscription that contains a storage account named storage1. The storage1 account contains a container named container1. You need to configure...

You have an Azure subscription that contains a storage account named storage1. The storage1 account contains a container named container1.
You need to configure access to container1. The solution must meet the following requirements:
• Only allow read access.
• Allow both HTTP and HTTPS protocols.
• Apply access permissions to all the content in the container.
What should you use?

A. an access policy B. a shared access signature (SAS) C. Azure Content Delivery Network (CDN) D. access keys