Old 2.4-GHz wireless laptops are unable to connect. What is the most likely cause of this problem?
A. WLAN > General properties are incorrectly configured.
B. WLAN > QoS properties are incorrectly configured.
C. WLAN > Security properties are incorrectly configured.
D. WLAN > Advanced properties are incorrectly configured.
E. Wireless > AP > 802.11 b/g/n AP is incorrectly configured.
F. Wireless > AP > 802.11 b/g/n > Network is incorrectly configured.