Answer:
Prototype
I think this is the word ur looking for!
Extensible Hypertext Markup Language.
A: provides its services to the Web server in a way that is totally transparent to the client browser.
It is B- An L-type cylinder head.
Since you are searching for researching information, .edu will be more reliable.
.edu is for education purpose, with credits of scholars.
.com is a general URL, it's not relavant to reliability.
