You need to ensure that you can add the desired policy

You manage API management policies in Azure.
You attempt to add a policy that is marked as unavailable.
You need to ensure that you can add the desired policy.
What should you do?

A.
Modify the API Management policy definition.

B.
Enable custom caching for the API Management service.

C.
Modify the scope of the API policy.

D.
Integrate the API Management service with the Azure Event Hub service.