For security reasons, an administrator removes a user from the Active Directory domain used by
all ESXi hosts for authentication. At the time the user is removed they are actively logged into an
ESXi 5.x host through the vSphere Client.
What is true regarding this scenario?

A.
The user immediately loses connectivity to and permissions on the host.

B.
The user retains permissions and connectivity to the host for up to 24 hours.

C.
The user retains permissions on the host until the host is rebooted.

D.
The user retains permissions on the object until the next time the user logs in to vCenter
Server.

Explanation:
http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxivcenter-server-50-security-guide.pdf