单项选择题
AcustomerhasanIBMSystemStorageDS8100andwantstoreachthehighestpossiblethroughputintheback-endforastorage-pool-stripedvolumeoutofanextentpoolwith8ranks.Overhowmanydeviceadapterpairsshouldatechnicalspecialistspreadtheworkload（）
A.2
B.4
C.6
D.8
A.Overhowmanydeviceadapterpairsshouldatechnicalspecialistspreadtheworkload（）
A.2
B.4
C.6
D.8