WPA2 uses AES for wireless data encryption at which of the following encryption levels?

WPA2 does not operate at 64-bit encryption - AES under WPA2 uses a minimum of 128-bit keys; 64-bit would be cryptographically insufficient by modern standards.

CRC (Cyclic Redundancy Check) is an error-detection algorithm, not a cryptographic integrity or encryption protocol, and is not used as the encryption component in WPA2.

WPA2 (IEEE 802.11i) mandates AES (Advanced Encryption Standard) with a 128-bit key and uses CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol) as its data confidentiality and integrity mechanism. CCMP replaced the weaker RC4-based TKIP from WPA and provides both encryption and message integrity checking in a single protocol.

TKIP (Temporal Key Integrity Protocol) was used in WPA (the predecessor to WPA2) as a stopgap improvement over WEP; WPA2 specifically replaced TKIP with CCMP for stronger security.