Which of the following is a block cipher?

AES

https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

AES is a subset of the Rijndael block cipher developed by two Belgian cryptographers, Vincent Rijmen

and Joan Daemen, who submitted a proposal to NIST during the AES selection process

Incorrect answers:

RC4. RC4 (Rivest Cipher 4 also known as ARC4 or ARCFOUR meaning Alleged RC4, see below) is a

stream cipher.

DH. Diffie–Hellman key exchange is a method of securely exchanging cryptographic keys over a

public channel and was one of the first public-key protocols as conceived by Ralph Merkle and

named after Whitfield Diffie and Martin Hellman.

RSA. RSA (Rivest–Shamir–Adleman) is one of the first public-key cryptosystems and is widely used for

secure data transmission.