Which Virtual Machine cannot be protected by the Distributed Firewall?
A. A Virtual Machine connected to a vDS Portgroup running on an ESXi 5.1 host.
B. A Virtual Machine connected to a vSS Portgroup running on an ESXi 5.5 host.
C. A Virtual Machine connected to a vDS Portgroup running on an ESXi 5.5 host.
D. A Virtual Machine connected to a logical switch running on an ESXi 5.1 host.
