You administer a Microsoft SQL Server 2012 database that contains a table named AccountTransaction.
You discover that query performance on the table is poor due to fragmentation on the IDX_AccountTransaction_AccountCode non-clustered index. You need to
defragment the index. You also need to ensure that user queries are able to use the index during the defragmenting process.

Which Transact-SQL batch should you use?

A.
ALTER INDEX IDX_AccountTransaction_AccountCode ON
AccountTransaction.AccountCode REORGANIZE

B.
ALTER INDEX ALL ON AccountTransaction REBUILD

C.
ALTER INDEX IDX_AccountTransaction_AccountCode ON
AccountTransaction.AccountCode REBUILD

D.
CREATE INDEX IDXAccountTransactionAccountCode ON
AccountTransaction.AccountCode WITH DROP EXISTING