Question: What role does the F - function play in the Feistel structure of DES? Question 5 options: It generates the 5 6 - bit DES

What role does the F-function play in the Feistel structure of DES?
Question 5 options:
It generates the 56-bit DES key from the original 64-bit key.
It encrypts data using a public key infrastructure system.
It expands, substitutes, and permutes the right half of the data block using the round subkey.
It directly swaps the left and right halves of the data block without any further processing.

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