Which of the following is true regarding the differences between RC$4$ and Salsa$20/$ChaCha$20?$

Group of answer choices

They both use the same PRNG$,$ however RC$4$ performs encryption and decryption using the MOD function while Salsa$20/$ChaCha$20$ use the XOR function.

They both use exactly the same PRNG code and encryption code, however RC$4$ allows a variable size key while Salsa$20/$ChaCha$20$ require the key to be $2048$ bits.

They both encrypt and decrypt data using the XOR function, but they use different PRNG code.

None of the above.