A user has just moved a PC from one office to another. The patch cable and the NIC do notappear to be functioning in the new office but were working before the move. The patch cable is plugged in correctly to both the NIC and the wall jack. Which of the following actions should the technician take FIRST?（）

A. Verify that the network card is compatible with the operating system.
B. Verify that the port on the switch is enabled.
C. Update the network card driver.
D. Replace the network cable with a crossover cable.