Which two statements best describe the

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

AIt specifies use of a static encryption key that must be changed frequently to enhance security
BIt requires use of an open authentication method
CIt specifies the use of dynamic encryption keys that change each time a client establishes a connection
DIt requires that all access points and wireless devices use the same encryption key
EIt includes authentication by PSK

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