多项选择题
A.are optional
B.are used to protect data beans
C.provide coarse-grained access control
D.never specify a relationship
单项选择题 Intheeventofafailure，whatwouldbetheMOSTcompletemethodforrecoveringtheWebSphereCommercedatabase？（）
多项选择题 AnadministratorreceivesanerrorwhenattemptingtoexecuteaWebSphereCommercecommandanddecidestotakethefollowingstepstotroubleshoottheproblem：ChecktoseeiftherequestwasprocessedbytheWebSphereplug-inbutwasneverreceivedbytheWebSphereApplicationServerCheckforJavaerrorsfromEJBsandservletsTraceWebSphereCommerceServersubsystemsandcommandsWhichofthefollowingfilesshouldtheadministratorchecktoaccomplishthesesteps？（）
多项选择题 WhenastagingserverisusedasanenvironmentfortestingnewdatainadefaultWebSphereCommerceinstallation，whichofthefollowingaretrueaboutthestagingserver？（）