When a user requesting an object via HTTP/1.1 needs to be authenticated?

A.
The server will always return status code 200.

B.
The server will return status code 402 if it is the target of the request, or status code 407 if it is a proxy-server requiring
authentication to the proxy first.

C.
The server will return status code 401 if it is the target of the request, or status code 302 if it is a proxy-server requiring
authentication to the proxy first.

D.
The server will always return status code 404.

E.
The server will return status code 401 if it is the target of the request, or status code 407 if it is a proxy-server requiring
authentication to the proxy first.