Which two statements best describe the wireless security standard that is defined by WPA？ （Choose two.）（）

• A、It specifies use of a static encryption key that must be changed frequently to enhance security.
• B、It requires use of an open authentication method.
• C、It specifies the use of dynamic encryption keys that change each time a client establishes a connection.
• D、It requires that all access points and wireless devices use the same encryption key.
• E、It includes authentication by PSK