What is the first step in creating an IBM Integration Bus (IIB) based pattern?

What is the first step in creating an IBM Integration Bus (IIB) based pattern?
A . Every new application may require a pattern. So start with creating a pattern project.
B . Identify an exemplar project and the variants to be replaced in the generated instance.
C . Create a Java class that may be used in the pattern generation for changing the default behavior.
D . Investigate how to create eclipse plugin since the IIB patterns are built as eclipse plugins for the toolkit.

Answer: C