Hello, teachers!

Would you please check this short dialog and tell me if these are all acceptable?

A; Do you happen to know how often it happens?
B; [_________]
1. I'm not informed enough about that.
2. I've not been informed enough about that.
3. I don't have enough information about that.

Thank you very much.
Hi Jandi,

I'm not sure what you are trying to do here. All answers are grammatically correct, but none are conversationally natural; it would more likely go like this:

A: 'Do you happen to know how often it happens?'
B: 'Afraid not.'
Sorry for my stupid question, and thank you for your kind help!

Enjoy the constant chirping of the crickets!