What is the maximum length of the vertical taut-wire sensor (VTWS)?

Which of the following terms is an example of a character-string constant?

a) 123 b) ABC c) GRADE d) none of the above

The Remote ____________________ Dial-In User Service system centralizes the management of user authentication by placing the responsibility for authenticating each user in the central RADIUS server.

Fill in the blank(s) with the appropriate word(s).