Explain how each of the following procedures strengthens a company's internal control:

a. Susan Corporation's photocopy machines are activated by keying a code number. Each employee is assigned a different, confidential code number. Each copy machine keeps track of the number of copies run under each employee number.

b. Pike Company's bank requires a signature card on file for each Pike Company employee who is authorized to sign checks.

c. Speedy Stop Convenience Stores have programmed their cash registers to imprint a blue star on every 300 th receipt printed. A sign by each cash register states that the customer will receive \(\$ 2\) if his or her receipt has a blue star on it.

d. Wurst Corporation has a policy that every employee must take two weeks of vacation each year.