MP2A form - certificate of no impediment / certificate of freedom

Hi

Filling out the MP2A here for solicitor to sign tomorrow.

In section 1, it mentions "and am one and the same person as ______ named on the civil certificate of birth upon which, marked with the letter "A", I signed my name before making the Declaration (a long form birth certificate must be produced)."

Questions

Do i mark my birth certificate as A somewhere?
Do i use original birth cert or a photocopy? Department of Foreign Affairs have requested original but I read elsewhere that i should mark a photocopy as A on back of page.
Does solicitor have to sign and stamp birth cert in addition to MP2A form?

Sorry for all the questions but i'm hoping someone on here has went through this process recently.

MM