How would you respond to a “none of your business” question?

From experience: I may have been rude with my response, but they were rude for asking me something that did not pertain to them.

1. I said, “It’s personal” and with that look and nothing else was said.
2. I said, “It’s none of your business” and nothing else was said.
3. I said, “It’s nothing that I care to talk about” and nothing else was said.