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多选题
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
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