Linux brought much of the speed, efficiency, and flexibility of UNIX to small desktop computers.

Match the following terms to their meanings:

I. cell address II. range III. function IV. filter V. arguments A. a group of contiguous cells B. prewritten formulas C. A1, B5, or AA46 D. provides instructions for function execution E. restricts records based on criteria

Matthew, Richard, and Christopher would like to exchange messages with each other using symmetric cryptography. They want to ensure that each individual can privately send a message to another individual without the third person being able to read the message. How many keys do they need?

A. 1 B. 2 C. 3 D. 6