问题：

[多选] Which two of these statements best describe the benefits of the Cisco Compatible Extensions Program？ （Choose two.）（）

A .  offers a feature-rich implementation alternative to Wi-Fi certification
B .  accelerates the availability of innovative features while maintaining interoperability
C .  provides innovative features only on Cisco’s wireless client adapters
D .  provides an evolving set of specifications for interoperability
E .  eliminates the need for testing by providing innovative features to wireless client vendors through a one-time license fee