Solution
DES
DES is a block cipher that encrypts data in 64-bit blocks. This implies that 64 bits of plaintext are supplied to DES, which generates 64 bits of ciphertext. Encryption and decryption employ the same algorithm and key, with slight variations. The key is 56 bits long.
AES
AES is extensively used because it is significantly more secure than DES and triple DES, although being more difficult to implement. The AES (Advanced Encryption Standard) is a block cipher. Key size can be 128/192 or 256 bits. Encrypts data using 128-bit blocks.
3 DES
Triple DES is a method of encryption that employs three instances of DES on the same plaintext. It employs three distinct key selection strategies: in the first, all utilised keys are unique; in the second, two keys are identical and one is unique; and in the third, all used keys are identical. Triple DES is also vulnerable to meet-in-the middle attack because of which it give total security level of 2^112 instead of using 168 bit of key.
RSA
RSA is an asymmetrical cryptographic algorithm. Asymmetric implies that it operates on two distinct keys, namely the Public Key and the Private Key. As its name implies, the Public Key is made available to everyone, while the Private Key is kept secret. The public key is composed of two numbers, one of which is a product of two huge prime numbers. In addition, the private key is derived from the same pair of prime numbers. Consequently, the private key is compromised if someone can factorise the huge integer. Therefore, the encryption strength is entirely dependent on the size of the key, and if we double or triple the key size, the encryption strength increases exponentially. RSA keys typically consist of 1024 or 2048 bits.
Hence, option 2) is correct.