Which Statement Is Correct About WWW-Authenticate Header

Which statement is correct about WWW-Authenticate header?

A) It is request header used only with Basic Authentication to send username and password to a proxy or a Web server
B) It is a request header used to send credentials
C) It is a response header used with HTTP 401 status code to negotiate method of authentication and send NTLM challenge to the client.

Correct Answer:

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