You install a WLAN in a warehouse environment for a customer. three months after the installation, the customer reports that the devices in the environment show a poor RSSI is some areas. Which…

An increase of stock in the warehouse, especially items containing liquids or dense materials, can significantly absorb or reflect Wi-Fi signals. This physical obstruction creates new RF shadows and attenuation, leading to a decrease in Received Signal Strength Indicator (RSSI) in previously well-covered areas.

An increase in the number of wireless clients typically leads to congestion and lower throughput, but it does not directly cause a decrease in RSSI for existing coverage areas.

RF interference from external sources like microwave ovens can degrade performance by increasing noise and retransmissions, but it primarily affects signal quality rather than a general reduction in an AP's RSSI across an area.

Another WLAN in a neighboring warehouse would primarily cause co-channel or adjacent-channel interference, leading to slower speeds and retransmissions, rather than a direct reduction in the RSSI of existing APs' signals.