What is the benefit of a Data Center Extension inside of VMware vCloud Director Extender?

A. register an existing IPsec VPN tunnel to access the VMware vCloud Director environment

B. create trunk ports inside of a VMware virtual Distributed Switch for vCloud Director Extender usage

C. create an NSX L2 VPN connection to stretch on-premises networks to a VMware vCloud Director environment

D. use automation to create VMware vCloud Director Extender appliances