What does the number 0 displayed next to an object, text, or placeholder indicate?

Farah works in an office with two other employees. all three share a printer and an internet connection. the utility that makes this possible is defragger quicktime soho winzip

Assume that there is a 4% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

What are listed in the vertical columns across the top of the event editor? a. file names b. conditions c. check marks d. action types