Advanced encryption standard is an algorithm used for which of the following?

Data integrity is provided by hashing algorithms such as SHA-256 or HMAC constructs, not by AES, which is a confidentiality-focused encryption algorithm.

Key discovery is not a defined cryptographic function - AES neither generates nor recovers keys; key management is handled by separate key exchange protocols such as Diffie-Hellman.

AES (Advanced Encryption Standard) is a symmetric-key block cipher that operates on 128-bit blocks with key sizes of 128, 192, or 256 bits, making it highly efficient for encrypting large amounts of data at rest or in transit. It is the dominant algorithm for bulk data encryption in protocols such as TLS, disk encryption tools like BitLocker, and file encryption standards. Its design prioritizes throughput and security, not key management or integrity checking.

Key recovery refers to mechanisms for retrieving lost encryption keys and is a key management concern, not a function performed by AES itself.