WhichstatementsabouttheMEMORY_TARGETinitializationparameteraretrue？（）
A.MEMORY_TARGETcanbeincreaseduptothevalueofMEMORY_MAX_TARGET，if
B.MEMORY_MAX_TARGETdefaultstoavalueofzeroifMEMORY_TARGETisnotset
C.MEMORY_TARGETrepresentsthetotalamountofmemorythatcanbeallocatedtoSGAandPGAmemorystructures.
D.MEMORY_TARGETisstaticandcannotbemodifiedwithoutshuttingdowntheinstance