单项选择题

Acompanybacksuptheirdatausingdaily，weekly，andmonthlytapebackups.Theweekly backupsarealsoknownaswhichofthefollowing？（）

A.Son
B.Father
C.Grandfather
D.Great-grandfather

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单项选择题

Anadministratorneedstoexplaintomanagementwhyupdatesareneededfortheserver.Which ofthefollowingistheBESTexplanationtogive？（）

A.Theupdatesguaranteethattheserverwillworksmoothly.
B.TheupdatesshowmanagementthatITisworkingdiligently.
C.Theupdatesaddressdriverandsecurityissues.
D.Theupdatesareneededtoallowthesystemmonitoringagentstoconnecttothesystem.

单项选择题

Whichofthefollowingportsdoesatelnetapplicationutilize？（）

A.21
B.23
C.80
D.443