is a method of attack that involves saturating the target machine with external communication requests so much so that it cannot respond to legitimate request or subject to slow extremely slow response

Which of the following statements best describes it careers?

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 three software programs for mobile computing?