单项选择题
A.Business needs
B.Risk analysis
C.Security policy
D.Best practices
单项选择题 WhichPublicKeyCryptographicStandards（PKCS）definesthesyntaxforencryptedmessagesandmessageswithdigitalsignatures？（）
单项选择题 Examinethefollowingoptions，whichSpanningTreeProtocol（STP）protectionmechanismdisablesaswitchportiftheportreceivesaBridgeProtocolDataUnit（BPDU）？（）
多项选择题 Observethefollowingoptionscarefully，whichtwoattacksfocusonRSA？（）