Final answer:
SSL (Secure Sockets Layer) is a protocol for encrypting transmissions.
Step-by-step explanation:
The correct answer is SSL (Secure Sockets Layer). SSL is a protocol for encrypting transmissions. It allows a client and server to negotiate a connection and agree on various parameters to establish the connection's security. SSL is commonly used to secure online communication, such as websites and email.
When a client and a server wish to establish a secure communication channel, they utilize a handshaking procedure to agree on various parameters that determine the security of the connection. This process ensures that data can be transmitted over the internet in a way that is protected against eavesdropping and tampering.