What is the role of a connector when the Loader of FusionInsight HD is creating a job?

What is the role of a connector when the Loader of FusionInsight HD is creating a job?
A . Identify the transformation steps
B . Provide optimization parameters to improve data import and export performance
C . Configure the job how to connect with the external data sources
D . Configure the job how to connect with the internal data sources

Answer: C