单项选择题

Inyourdatabase，UNDO_RETENTIONhasbeensetto600secandUNDOtablespaceisconfiguredforRETENTIONGUARANTEE.WhichstatementregardingRETENTIONGUARANTEEistrue？（）

A.Undodataisretaineduntilthenextfulldatabasebackup.
B.Nocommittedundodatawillbeoverwrittenfor10minutes.
C.Committedundodatawillbekeptforeverifnotoverwrittenwithin600seconds.
D.Guaranteesthatrequestedundoinformationareavailableuntiltheinstanceisshutdown.

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InUCSM,whereareCallHomeconditionsformonitoringconfigured?（）

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Whileusingapacketanalyzer，younoticefouradditionalbytesbeingaddedtothepacketsintheCompanynetwork.WhichprotocolinsertsafourbytetagintotheEthernetframeandrecalculatesCRCvalue？（）

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