Which of the following are the major components of the IPsec protocol? Each correct answer represents a complete solution

Which of the following are the major components of the IPsec protocol? Each correct answer represents a complete solution. Choose all that apply.

A.
Encapsulating Security Payload (ESP)

B.
Authentication Header (AH)

C.
Internet Encryption Key (IEK)

D.
Internet Key Exchange (IKE)