The correct answer is option 1:One way function is a function that computes an output for every input in a deterministic time and the reverse operation (for a given output, extracting the input) can be computationally hard.Commonly used in storing and transferring passwords and other sensitive data.In some cases, one-way functions can be mapped to a particular input using various methods like Brute force.Additional InformationIn an Inversible function, for each input there is exactly one output. Hence for any given output, there exists only one input.This makes guessing the input keywords easy for anyone. So it is not usually recommended in cryptographic hash functions.