You are a database administrator for your company. You are responsible for a SQL Server 2005 database that has several indexes. You need to write a stored procedure that checks the indexes for fragmentation. Which Transact-SQL statement should you use？（）

A. DBCC DBREINDEX
B. SELECT * FROM sys.dm_db_index_physical_stats
C. DBCC INDEXDEFRAG
D. SELECT * FROM sys.indexe