The number of files that each end of a client/server connection including SSL support use to set up secure communications is . . . . . . . .

This question asks about how many files are used when a client and server communicate securely using SSL (Secure Sockets Layer). SSL is a protocol that encrypts communication between two parties.

The answer is Option C: 2. Here's why:

1. First File (Handshake): When a client and server establish a secure connection, they go through a handshake process. This handshake involves exchanging information to verify each other's identities and set up the secure channel. This process uses one file.
2. Second File (Data Transfer): Once the handshake is complete, the actual data transfer begins. This data transfer also uses a separate file to ensure secure communication.

So, in total, two files are used for a secure connection with SSL.