What is part of a database that holds only one type of information?

What is part of a database that holds only one type of information?

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1) Who created Pretty Good Privacy (PGP)?

2) What do we call a collection of two or more computers that are located within a limited distance of each other and that are connected to each other directly or indirectly?

3) Compact discs, (according to the original CD specifications) hold how many minutes of music?

4) What is the term to ask the computer to put information in order numerically or alphabetically?

5) Who is largely responsible for breaking the German Enigma codes, created a test that provided a foundation for artificial intelligence?