What is causing the login failure?

Refer to the output:

A network outage occurs. A technician tries to log in to a switch by Telnet using the correct local username and password.
What is causing the login failure?
A. Authentication is not enabled on Telnet.
B. Local accounts are not allowed.
C. TACACS credentials are not being used.
D. A Telnet approved account must be used.

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