_________ tracks and reports the current read and write activity of a MongoDB instance, and reports these statistics on a per collection basis.

_________ tracks and reports the current read and write activity of a

1.	_________ tracks and reports the current read and write activity of a MongoDB instance, and reports these statistics on a per collection basis.
A.	mongostat
B.	mongod
C.	mongotop
D.	all of the mentioned
Answer» D. all of the mentioned