Which of the following is NOT an encryption method used by VPNs (Virtual Private Networks)?

A.
IPSEC – IP Security

B.
L2F – Layer 2 Forwarding

C.
L2TP – Layer 2 Tunneling Protocol

D.
SSH – Secure Shell

E.
PPTP – Point to Point Tunneling Protocol

F.
All of the above are encryption methods used by VPNs