Which performance testing operational activity pattern assists In identifying system functionality that may require correction or optimization?

Which performance testing operational activity pattern assists In identifying system functionality that may require correction or optimization?
A . Batch requests are collections of activities a SUT performs from inititaion through termination of one or more processes commonly measured for their elapsed time.
B . Concurrencies are collections of activities a SUT performs from inititaion through termination of one or more processes commonly measured for their elapsed time
C . Stakeholder requests are collections of activities a SUT performs from inititaion through termination of one or more processes commonly measured for their elapsed time.
D . Transactions are collections of activities a SUT performs from inititaion through termination of one or more processes commonly measured for their elapsed time.

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Answer: B