You are experiencing performance issues for a given job. You are assigned the task of
understanding what is happening at run time for that job. What step should you take to understand
the job performance issues?

A.
Replace Join stages by Lookup stages.

B.
Run the job with $APT_TRACE_RUN set to true.

C.
Run the job with $APT_DUMP_SCORE set to true.

D.
Replace Transformer stages with custom operators.

Explanation: