Preposition with the noun “password”

Question

1. What’s the password of/to/for your wifi?

Which preposition can be used here? I have heard many people say “of” in my country. However, I personally use “for”. I would like to know the correct usage.

Answer 1

I believe that all are valid. I would use any of the three, depending on how I feel, but probably more likely to use "for" and least likely to say "of".