1. Review how the program counter is used to keep track of the next instruction to execute, how procedures are executed, and what happens when the procedures instructions finish. Explain how the return address can be part of an attack that causes the computer to lose control of the execution of software.

1. Suppose that Bob ran a busy, small auto repair business with a few other mechanics, sharing Bobs single computer system to track the work done.

Each mechanic works with the same job-tracking program and uses their own logon, but creates a unique folder for each job, preferring to control access to his/her job folders.

Each mechanic creates a new photograph image file to document each major step in each job, within the folder for the job

(a) Explain what the permissions for each folder should be, including all users and groups, to protect each mechanic from the others.