In the Huawei OceanStor Storage Array, the Write Cache High

In the Huawei OceanStor storage array, the write cache high watermark is 80 and the low watermark is 20, and the service type is multiple-order small IO. To achieve better performance, it is advisable to adjust the water marks in which way?

A) high water to 90
B) high water to 70
C) low water line 10
D) low water line 30