Which of these must you know about a corporate VPN server before you can configure the VPN software on an OS X computer to access the corporate network?

A.
If the corporate VPN server supports DNSSEC

B.
If the corporate VPN server supports PPPoE

C.
If the corporate VPN server supports PPTP, L2TP over IPSec, or Cisco IPSec

D.
If network protocols will be encapsulated by the corporate VPN server