Which of the Following Is Not True About One-Time Passwords

Multiple Choice

Which of the following is not true about one-time passwords?

A) Users' pagers or smart phones via text messaging) can receive them.
B) They can be used in conjunction with a token system.
C) The user must enter the one-time password to gain access or the connection is terminated.
D) This is a good security solution for users who travel frequently and who must have secure dial-in access.
E) They create a packet level firewall on the system.