You work as an application developer at Certkiller .com. Certkiller .com is currently using a performance counter named HitCounter. 
You are required to increment each time a user accesses the UI classes within the application. To do this， you start by creating performance counters using the following code： 
You have to adjust the HitCounter performance counter when a hit occurs. What should you do？（）

A.A
B.B
C.C
D.D