AbankingcustomerplanstoimplementaBladeCenterHchassis.TheyplanforsevenHS22blades，sixHX5bladeswithMAX5，one1UexternalFibreChannelswitch，andtwo3UFibreChannelstoragedeviceswithfourteen146GBdrives.Whichistheminimumamountofrackspacerequiredtoimplementthesolutionofthefollowing？（）
A.32U
B.21U
C.25U
D.22U
参考答案：C
