you need to do in order to analyze HTTP and HTTPS request headers and the HTML source code?

During the process of fingerprinting a web application environment, what do you need to do
in order to analyze HTTP and HTTPS request headers and the HTML source code?

A.
Examine Source of the Available Pages

B.
Perform Web Spidering

C.
Perform Banner Grabbing

D.
Check the HTTP and HTML Processing by the Browser