What is the difference between IPsec tunnel and transport mode?

What is the difference between IPsec tunnel and transport mode?
A . Tunnel mode uses encryption and transport mode uses TCP as the transport protocol.
B . Tunnel mode uses encryption and transport mode uses UDP as the transport protocol.
C . Transport mode protects upper-layer protocols, such as UDP and TCP, and tunnel mode protects the entire IP packet.
D . Tunnel mode protects upper-layer protocols, such as UDP and TCP, and transport mode protects the entire IP packet

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Answer: C