How do you troubleshoot this problem?

A customer’s transformation Is running slowly in a lest environment. You have access to Spoon and you can run and monitor the job.

How do you troubleshoot this problem?
A . Execute the transformation via the pan script and pass the performance gathering parameter.
B . Ensure there is enough memory on the Pentaho server and that there are no "Out Of Memory’ errors in the log.
C . Make sure the customer is using data partitioning to ensure parallel processing for fasterexecution
D . Verify that there are no bottleneck slaps m the transformation by comparing the amount of rows in the input buffer versus the output buffer within the Step Metrics tab

Answer: A