问题：

[单选]

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?（）

A . Run DLPAR to change the LPAR memory for each test.
B . Run rmss command to simulate different memory for each test.
C . Run chdev command to limit the system memory size for each test.
D . Run chattr command to limit the system memory size for each test.