Which of the following security controls is standardized by the Internet Engineering Task Force (IETF) as the primary network layer protection mechanism

Which of the following security controls is standardized by the Internet Engineering Task Force (IETF) as the primary network layer protection mechanism
A . Internet Key Exchange (IKE) Protocol
B . SMIME
C . Internet Protocol Security (IPSec)
D . Secure Socket Layer (SSL)

Answer: C