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Youcreateaserviceapplicationthatmonitorsfreespaceonaharddiskdrive.Youmustensurethattheserviceapplicationrunsinthebackgroundandmonitorsthefreespaceeveryminute.Whatshouldyoudo？（）

A.AddcodetothedefaultconstructoroftheServiceclasstomonitorthefreespaceontheharddiskdrive.

B.AddcodetotheOnStartmethodoftheServiceclasstomonitorthefreespaceontheharddiskdrive.

C.AddaninstanceoftheSystem.Windows.Forms.TimerclasstotheServiceclassandconfigureittofireeveryminute.

D.AddaninstanceoftheSystem.Timers.TimerclasstotheServiceclassandconfigureittofireeveryminute.

E.AddcodetotheOnStartmethodoftheServiceclasstostartthetimer.

F.AddcodetotheElapsedeventhandlerofthetimertomonitorthefreespaceontheharddiskdrive.

G.AddcodetotheTickeventhandlerofthetimertomonitorthefreespaceontheharddiskdrive.

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第1题

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第2题

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第3题

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第5题

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第6题

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第7题

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