What is the function of the Web Proxy Auto-Discovery protocol?

What is the function of the Web Proxy Auto-Discovery protocol?

A.
It enables a web client to discover the URL of a configuration file.

B.
It enables a web client to download a script or configuration file that is named by a URL.

C.
It enables a web client’s traffic flows to be redirected in real time.

D.
It enables web clients to dynamically resolve hostname records.