YouworkasanapplicationdeveloperatCertkiller.com.Certkiller.comiscurrentlyusingaperformancecounternamedHitCounter.YouarerequiredtoincrementeachtimeauseraccessestheUIclasseswithintheapplication.Todothis，youstartbycreatingperformancecountersusingthefollowing
题目
YouworkasanapplicationdeveloperatCertkiller.com.Certkiller.comiscurrentlyusingaperformancecounternamedHitCounter.YouarerequiredtoincrementeachtimeauseraccessestheUIclasseswithintheapplication.Todothis，youstartbycreatingperformancecountersusingthefollowingcode：YouhavetoadjusttheHitCounterperformancecounterwhenahitoccurs.Whatshouldyoudo？（）
A.A
B.B
C.C
D.D
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参考答案和解析
参考答案：A