What is the list of steps to match regular expressions using the Pattern and Matcher classes?

A.
A template from which objects are created

B.
1.Instantiate a pattern object from the expression you wish to match.
2. Instantiate a matcher object from the pattern that contains the string you want to check.
3. Use the matcher object to detect if the matcher matches the pattern.

C.
HTTPRequest, HTTPResponse, HTTP

D.
Primitive, sObject, Collections, Null