BeamFlex+ is RUCKUS ' s adaptive antenna technology and combines sophisticated software algorithms with an antenna array rather than relying solely on conventional radio-based beamforming. RUCKUS states that BeamFlex can provide up to approximately 6 dBi of additional signal gain by dynamically selecting optimized antenna patterns for each client. BeamFlex+ also incorporates adaptive polarization diversity through PD-MRC, enabling the AP to adapt to horizontal and vertical client orientations and improve reception from mobile devices. In addition, it can select patterns that direct RF energy away from interference sources, providing significant interference mitigation. BeamFlex+ does not require an 802.11ac-capable client because its antenna adaptation occurs on the AP and remains client independent. It is useful across many deployment densities rather than being intended specifically for sparse environments. Therefore, B, E, and F are correct.