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 servers 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.