Public trust clearance and form OF-306

The job that I am applying for will require public trust security clearance. For the intent of this question let’s say I have to fill sf-85P. (moderate)

8 years back I was convicted of misdemeanor. I was fined and given a two year probation. Later I got an expungement and my conviction was dismissed.

Questions:

1-I would like to ask the members of this forum that from their experience what are the chances that I would be able to pass the security clearance.

2-"in past 7 years, have you been arrested for, charged with, or convicted of any offense(s)"
Is it ok to answer NO to this question because the conviction happened 7 years and 11 months ago?
Or should I disclose the expunged misdemeanor with an explanation. I am not sure if this would ‘open the door’ for follow-up, to a question that was never asked.

3- In form OF-306 “Declaration for Federal Employment” under Background information it says following:
For questions 9 your answers should include convictions resulting from plea of nolo contendere but omit any conviction for which the record was EXPUNGED under federal and state law.
9) During last 7 years have you been convicted, been imprisoned, been on probation or been on parole?

My probation ended 6 years back, so technically I was on probation in past 7 years. However as I stated before my conviction was expunged by the state after completing probation. Should I answer NO to question 9 as the instructions say, omit charges that were expunged?

Under so circumstance do I want to trick the system.

I would really appreciate any advice.

Just for clarification, public trust investigation is not security clearance investigation.

As for your particular situation, I think the questions are straightforward so is your situation. You aren’t tricking the system by answering it honestly and accordingly. So, answer the questions as asked nothing more nothing less.

Thank you, @AWoodhull.