A.The system requires 220V power to enable the upper SMP expansion module.
B.The technician cabled the SMP expansions wrong.
C.The Xcel4 cache needs to be reset in the BIOS because of the addition of the second SMP expansion module.
D.If no hardware licenses keys have been purchased for the processors in the upper SMP expansion module， it will not be activated.

A.CPU，because the database replication process requires a considerable amount of CPU time
B.Memory，because the buffer cache requires a large amount of memory to maintain the data in system memory
C.Disk，because it is important to configure a sufficient number of disks to match the CPU processing power
D.Network，because the data returned to the client from the server can be a large subset of the total database