TestKing.com uses SQL Server 2005. A user reports that an order processing application stopped responding in the middle of an order transaction. The users SQL Server session ID is 54. You need to find out if session 54 is blocked by another connection. If it is,you need to identify the blocking session ID. What are two possible ways to achieve this goal？（）

• A、In SQL Server Management Studio， open the Activity Monitor. Open the Process Info page. View the blockedBy column for session 54.
• B、In SQL Server Management Studio，open the Activity Monitor. Open the Locks by Process page. View the Request Mode column for session 54.
• C、In SQL Server Management Studio， open a new query window and execute the following statement.SELECT * FROM sys.dm exec requests WHERE session id = 54View the blocking session id column.
• D、In SQL Server Management Studio， open a new query window and execute the following statement.SELECT * FROM sys.dm exec sessionsWHERE session id = 54View the status column.