A technician recently installed a new wireless access point for a SOHO with the latest wireless technologies. After the installation, users with older laptops report that their laptops no longer show the wireless network SSID, whereas users with newer equipment do not have this issue. Which of the following is MOST likely the cause?
a. The firmware was changed
b. The wireless cards do not support 802.11ac
c. The security type has been upgraded to WPA2
d. The administrator is not broadcasting the SSID