Acustomerwantstohaveemployeesworkfromremotelocationsaswellasintheoffice.Allcommunicationsmustbesecureandfilesmustbeprotectedfromaccessbyunauthorizedpeople.Theemployee’sapplications（databaseinsertsandreads）areonlyaccessedwithawebbrowser.Whichofthefollowingcapabilitiesisnecessary？（）
A.SSL
B.PGP
C.Fileencryptionprogram
D.Publickeyencryption
参考答案：A
