问题：
[单选题]A system administrator increases the mbuf pool allocation， then runs vmstat. It is noticed that the paging rate has not decreased. What is the most effective option to maintain the mbuf pool and decrease paging？（）
A、 Increase the number of CPUs.
B、 Increase the physical memory.
C、 Set the PSALLOC environment variable to ’late’.
D、 Set the PSALLOC environment variable to ’early’.
参考答案：
B
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