Which of the following does not have a master document underlying it?

Describe how to protect against unexpected loss of files

What will be an ideal response?

What was the importance of the Turing machine to today's computers?

a. It described a system that was a precursor to today's notebook computer. b. It was the first electronic calculator and a precursor to the computer. c. It was the first computer to have a monitor. d. It described a process to read, write, and erase symbols on a tape and was the precursor to today's RAM.