Question: Which of the following statements regarding network security protocols is correct?

A) The Secure Socket Layer (SSL) is a protocol that provides secure communication over a computer network by encrypting data at the transport layer and is now considered obsolete in favor of Transport Layer Security (TLS).
B) Internet Protocol Security (IPsec) operates solely at the application layer and is used to secure end-to-end communication by encrypting data packets before they are sent over the network.
C) The Kerberos protocol is a symmetric key cryptography system that provides secure authentication for users in a networked environment and is based on a client-server architecture.
D) The Pretty Good Privacy (PGP) protocol is exclusively used for securing email communications and cannot be applied to any other type of data or communication.