Why should you log out when you finish an online session?
a. to prevent someone else from accessing your records
b. to advise the computer connection at penn foster that you are offline
c. to be courteous to others who may wish to use your computer
d. to speed up your computer for any other jobs you wish to perform

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?