TKIP (used with WPA) introduced "Michael" as a message integrity check (MIC) algorithm to replace the insecure CRC-32 used in WEP. Michael:
Adds tamper protection to each packet.
Helps detect packet forgery.
Incorrect:
A). CRC-32 was used in WEP and proven weak.
B). Sequence counters help prevent replay attacks, not integrity checking.
C). RC5 is not used in WLAN security.
E). TKIP does not support block ciphers-it uses RC4, a stream cipher.
References:
CWSP-208 Study Guide, Chapter 3 (TKIP Security Features)