What is the most appropriate scenario for using a class mediator over a Script mediator?

What is the most appropriate scenario for using a class mediator over a Script mediator?
A . For debugging purposes, you want to introduce some latency in the message flow.
B. You want to change just a single element in the XML payload without changing other elements.
C. For testing purposes, you want to record the elapsed time between calling a backend service and receiving the responseby the proxy service.
D. You want to develop a logging mediator that sends logging data to an external database such as MySQL.

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Answer: C