Indicate whether each of the following items regarding internal control is true or false.

a$)$ A common control activity is designing procedures to safeguard assets and ensure accounting records contain reliable information.

b$)$ A common control activity is preventing employees from taking regular vacations because duties should not be rotated.

c$)$ Whenever possible, the functions of authorization, recording and custody should be performed by the same dependable employee.

d$)$ Cash is most susceptible to embezzlement at the points of receipt and disbursement.

e$)$ Even a well$-$designed internal control system cannot prevent collusion by employees.