When is an ERP (802.11g) AP required by the IEEE 802.11-2012 standard to respond to probe request frames from nearby HR-DSSS (802.11b) stations? (Choose all that apply.)

When is an ERP (802.11g) AP required by the IEEE 802.11-2012 standard to respond to probe request frames from nearby HR-DSSS (802.11b) stations? (Choose all that apply.)
A . When the probe request frames contain a null SSID value
B . When the AP supports only ERP-OFDM data rates
C . When the AP supports only HR/DSSS data rates
D . When the Power Management bit is set to 1
E . When the probe request frames contain the correct SSID value

Answer: AE