A technician has installed an 802.11n network, and most users are able to see speeds of up to 300Mbps. There are a few users who have an 802.1 1n network card but are unable to get speeds higher that 108Mbps. Which of the following should the technician perform to fix the issue?
A. Upgrade the OS version to 64-bit
B. Roll back the firmware on WLAN card
C. Install a vulnerability patch
D. Upgrade the WLAN card driver