What Happens When ESXi Hosts Are Put into Lockdown Mode

Multiple Choice

What happens when ESXi hosts are put into lockdown mode?

A) No users are able to log into ESXi hosts, they must authenticate with vCenter Server.
B) No users are able to log into ESXi hosts through vCenter, they must log in directly.
C) The ESXi internal firewall is enabled, and only approved IPs in an access list can access the server.
D) The ESXi server no longer allows virtual machine modifications or changes in running state.