A user notifies an administrator that Content Libraries are not visible.
What is a possible solution?

A.
Assign the user the read-only role at the global permission level.

B.
Assign the user the read-only role at the vCenter Server root level.

C.
Assign the user the read-only role at the vCenter Server data center level.

D.
Assign the user the read-only role at the vCenter Server cluster level.

Explanation:

The direct parent for content libraries is the global root. This means that if you set a permission at a vCenter
Server level and propagate it to the children objects, the permission applies to data centers, folders, clusters,
hosts, virtual machines, and so on, but does not apply to the content libraries that you see and operate with in this vCenter Server instance. To assign a permission on a content library, an Administrator must grant the permission to the user as a global permission. Global permissions support assigning privileges across solutions from a global root object.
Reference: http://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.vm_admin.doc%
2FGUID-18F4B892-D685-4473-AC25-3195D68DFD90.html