When client's accounts payable computer system was relocated, the administrator provided support through a dial-up connection to server. Subsequently, the administrator left the company. No changes were made to the accounts payable system at that time. Which of the following situations represents the greatest security risk? Select one: a. Management procedures for user accounts are not documented. b. Security logs are not periodically reviewed for violations. O O c. User accounts are not removed upon termination of employees. d. User passwords are not required to the in alpha-numeric format. When computer programs or files can be accessed from terminals, users should be required to enter a(n): Select one: a. Password as a personal identification code. O b. Echo check. c. Parity check. d. Check digit