Which of the Following Is Not True About Telnet

Which of the following is not true about Telnet?

A) Telnet requires an application layer program on the client computer and an application layer program on the server or host computer.
B) Telnet poses no security threat.
C) Telnet was designed in the early days of the Internet.
D) You are using a host-based architecture with Telnet.
E) One program that conforms to the Telnet standard is EWAN.