A company's wireless network has been experiencing intermittent connectivity issues and slower than usual data transfer speeds.

The network administrator recently updated the firmware on the wireless access point $($WAP$)$ as part of a routine maintenance procedure. The update was applied during a scheduled downtime and the network was functional when the downtime ended.

However, the issues started appearing the next day. The administrator has checked the WAP settings and everything seems to be in order.

What could be the MOST likely cause of these issues?

The WAP's firewall was accidentally disabled during the update.

The MAC address filtering system was not configured correctly.

The Wi$-$Fi signal strength was set too high, causing interference.

The network administrator failed to properly test new updates before pushing them out to the network.