Which IPsec security protocol should be used when confidentiality is required?

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Question:
Which IPsec security protocol should be used when confidentiality is required?

MD5
PSK
AH
ESP

Explanation: IPsec is a pair of protocols, Encapsulating Security Payload (ESP) and Authentication Header (AH), Which provide security services for IP datagrams.

ESP can provide the properties authentication, integrity, replay protection, and confidentiality of the data (it secures everything in the packet that follows the IP header).

AH provides authentication, integrity, and replay protection (but not confidentiality) of the sender.

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