Whatarethreebenefitsofperformingdatadefinitionlanguage(DDL)statementsagainstapartitionedtablewiththeUPDATEGLOBALINDEXESclause?()

Whatarethreebenefitsofperformingdatadefinitionlanguage（DDL）statementsagainstapartitionedtablewiththeUPDATEGLOBALINDEXESclause？（）

A、GlobalindexesarerebuiltautomaticallyattheendoftheDDLoperationtherebyavoidingproblemswiththeUNUSABLEstatus.

B、YoudonothavetosearchforinvalidglobalindexesaftertheDDLcommandcompletesandrebuildthemindividually.

C、GlobalindexesaremaintainedduringtheoperationoftheDDLcommandandthereforecanbeusedbyanyconcurrentquery.

D、Globalindexesremainintactandavailableforusebydatamanipulationlanguage（DML）statementsevenforsessionsthathavenotenabledtheskippingofunusableindexes.