A FastT Host FC-2 bus adapter， a U320 SCSI adapter， and three 10/100Mb Ethernet adapters have to be installed as optimally as possible.  This is going to be a 24X7 system.  The addition of extra PCI-cards is a major consideration as well.  Based on the following， what is the best configuration？（） （1）Slot 1  66MHz  Bus 1       （2）Slot 2  66MHz  Bus 1       （3）Slot 3 100MHz  Bus 2       （4）Slot 4 100Mhz  Bus 2       （5）Slot 5 133Mhz  Bus 3       （6）Slot 6 133Mhz  Bus 3

• A、Put the Ethernet adapters in slots 1， 2 and 3. Put the FastT HBA in slot 5. Put the U320 adapter in slot 6.
• B、Put the Ethernet adapters in slots 1， 4 and 6. Put the FastT HBA in slot 5. Put the U320 adapter in slot 3.
• C、Put the Ethernet adapters in slots 1， 2 and 4. Put the FastT HBA in slot 3. Put the U320 adapter in slot 5.
• D、Put the Ethernet adapters in slots 1， 2 and 3. Put the FastT HBA in slot 5. Put the U320 adapter in slot 4