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YouaretheadministratorofaWindows2000Professionalcomputer，whichhasa56Kbpsmodem，connectedtoitself.Youwanttheusersonyourcompany’snetworktobeabletoconnecttotheInternetusingyourcomputer.But，youdonotwanttoallowanyotheroperationsthanHTTPandFTP.Whichportswillyouallowthroughthisconnection？（）
A.Port80
B.Port21
C.Port25
D.Port81
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