单项选择题
An administrator needs a network that can support up to 800 hosts on the same subnet. Which of the following is the MINIMUM subnet mask that should be used？（）
A.255.0.0.0
B.255.255.0.0
C.255.255.252.0
D.255.255.255.0
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AnadministratorcreatesanewdirectorythensharesitontheWindowsserver.Theadministrator setsthepermissionsforeveryoneto"Modify"butusersreporttheyareunabletocreateordelete documents.Whichofthefollowingisthecause？（）
A.The administrator forgot to change the share permissions
B.The users were not part of the “Everyone” built in group
C.The administrator shared the files but not the folder
D.“Modify” only allows users to change existing documents -
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A.RISC
B.CISC
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