Which two statements about the Wired Equivalent Privacy （WEP） encryption mechanism are true？ （）

A. the two methods of authentication using the WEP encryption are open and shared key
B. the 802.11 standard defines WEP security using 128-bit keys
C. WEP can provide stronger authentication through the use of LEAP， PEAP， or EAP-FAST
D. WEP is a scalable encryption solution that uses static keys for authentication
E. WEP security provides only one-way authentication
F. WEPv2 offers improved encryption by replacing the RC4 encryption mechanism with the AES （symmetric block cipher） mechanism