What is a Boolean Expression? A) Statements that only run when certain conditions are true
B) Something a program checks to see whether it is true before deciding to take an action
C) An expression that evaluates to true or false

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?