A server connects to iSCSI presented SAN storage array through a dedicated NIC; however, the SAN traffic is passed on the same switches as the Ethernet network and VoIP traffic. The size of the presented drive is 700GB. The administrator has noticed a decrease in storage performance. Which of the following is MOST likely the cause?（）

• A、The server power supply is starting to fail and causing the iSCSI NIC to intermittently lose power.
• B、There are too many users attempting to access the iSCSI presented disk.
• C、The other network traffic is causing packet delays in the iSCSI network.
• D、The SAN is nearing capacity and should be expanded