A cisco aironet 1020 controller-based access point has been connected to a catalyst 3550-24 pwr switch. however， when it is powered up， the access point fails. What has caused this problem？（）
- Aaccess point does not support 802.11h
- Bincorrect switch power supply
- Cswitch port is not enabled
- Dswitch does not support 802.3af
- Eaccess point has not been initialized with the primary controller