Youareusingthefollowingcommandtoclearthelogfilegroup：ALTERDATABASECLEARLOFFILEGROUP2；Inwhichcasewouldthecommandbesuccessful？（）

A．公共草原 B．高等教育 C．国防 D．公共卫生服务

A.Backupswillneverexpire. B.Itremovesanyretentionpolicy. C.TheDELETEOBSOLETEcommandwillfailwithanerror. D.ItsetstheretentionpolicytothedefaultofREDUNDANCY1.

A.ConfigureRRAS2asaVPNserver.UseWebenrollmenttoacquirecomputercertificatesforbothRRAS1andRRAS2.Createdemand-dialL2TP/IPSecconnectionsonbothRRAS1andRRAS2.Configuredial-outcredentialsonbothRRAS1andRRAS2.EnabletheBasicFirewallsettingsonRRAS1andRRAS2 B.ConfigureRRAS2asaVPNserver.Createdemand-dialL2TP/IPSecconnectionsonbothRRAS1andRRAS2.Configuredial-outcredentialsonbothRRAS1andRRAS2.ConfigurestaticroutesonbothRRAS1andRRAS2.Settheconnectiontypetopersistentonthedemand-dialinterfaceonbothRRAS1andRRAS2 C.CreateanewOUnamedRRASServersintheboston.northwindtraders.comdomain.MoveRRAS1intotheRRASServersOU.OntheDefaultDomainPolicyGroupPolicyobject（GPO），edittheSecureServer（RequireSecurity）IPSecpolicy.ConfiguretheIPSecpolicytouseacertificateforauthentication.SpecifyRRAS2asthetunnelendpoint.AssigntheIPSecpolicy. D.CreateanewOUnamedRRASServerinthenorthwindtraders.comdomain.MovetheRRAS2intotheRRASServersOU.OntheRRASServersOUcreatenewGroupPolicyobject（GPO）namedIPSECPOL.InIPSECPOLcreateanIPSecpolicyandspecifyRRASasthetunnel.

<img src='https://img2.soutiyun.com/shangxueba/ask/64233001-64236000/64234478/9691c5b47b07d813739fc0e9660c9439.jpg' /> A. The MEMORY_MAX_TARGET parameter is automatically set to 500 MB B. The value of the MEMORY_MAX_TARGET parameter remains zero till it is changed manually C. The PGA_AGGREGATE_TARGET and SGA_TARGET parameters are automatically set to zero D. The lower bounds of PGA_AGGREGATE_TARGET and SGA_TARGET parameters are set to 90 MB and 270 MB, respectively