Which of the following statements about WLAN device selection are true?(multiple choice)

Which of the following statements about WLAN device selection are true?(multiple choice)

A. Limitations over the Wi-Fi transmit power vary depending on the country code. A closer gap between the actual AP's transmit power and the upper limit specified in a local country or region results in stronger transmit signals and a longer coverage range.

B. The power supply mode varies with the deployment scenario. Currently, PoE power supply is used in most scenarios. In other scenarios, DC power supply or dual power supply backup can be used.

C. A greater antenna gain indicates stronger signals and higher power consumption. As such, the AP with a smaller antenna gain is preferred.

D. In an outdoor scenario, directional antennas are used for long-distance signal coverage and wireless backhaul, while omnidirectional

antennas are used for short-distance signal coverage.