Which of the following is true about the relationship between a file and the hash of the file?

a$.$

If you hash the same input file, sometimes you get a different output.

b$.$

If you use hash two files, you can recover both using their hash functions.

c$.$

If you hash a file and then lose the file, you can recreate the file from the hash function.

d$.$

The hash function generates a unique output which is generated by that input file.