You are a database administrator for your company. The company uses a SQL Server 2005 application. Each night， data is imported into a database， and the database is then set to be read-only. During business hours， users run predefined and ad hoc queries. You need to monitor the servers performance during the day. What are two possible ways to achieve this goal？（）

• A、Use the Lock Waits/sec performance counter.
• B、Use the Number of Deadlocks/sec performance counter.
• C、Use the Transactions/sec performance counter.
• D、Use the Full Scans/sec performance counter.
• E、Use the Batches/sec performance counter.