An administrator wants to test the performance of an application at different memory sizes. What is the most effective way to perform the test and collect statistical information for each test？（）
- ARun DLPAR to change the LPAR memory for each test.
- BRun rmss command to simulate different memory for each test.
- CRun chdev command to limit the system memory size for each test.
- DRun chattr command to limit the system memory size for each test.