When a system has both online transaction processing as well as large batch processing， which of the following common procedures will best help to improve system performance？（）

• A、 Boost the priority of batch jobs.
• B、 Schedule batch runs to reduce contention with OLTP.
• C、 Schedule OS maintenance such that it includes frequent application of PTFs.
• D、 Perform incremental backups of transaction processing and full backups of batch processing.