How does Encapsulating Security Payload (ESP) in transport mode affect in the Internet Protocol (IP)?

How does Encapsulating Security Payload (ESP) in transport mode affect in the Internet Protocol (IP)?
A . Authenticates the IP payload and selected portions of the IP header
B . Encrypts and optionally authenticates the complete IP packet
C . Encrypts and optionally authenticates the IP header, but not the IP payload
D . Encrypts and optionally authenticates the IP payload, but not the IP header

View Answer

Answer: D