After verifying she is using the delegated administrator account for the RODC at her branch site, Giovanna once again tries to create an OU on the RODC but is unable to do so$.$ What could be the problem?

a$.$

The RODC needs to be promoted to support additional DC services

b$.$

The option to grant domain rights was omitted during installation

c$.$

The account she is using does not have domain administrative rights

d$.$

She needs to add a group policy allowing the account to create UOs