Student or Learner
"Pleased to meet you".
The reply to this:
1- The pleasure is all mine.
3- Me, too.
a- What's your opinion about the three replies?
b- How do you reply on the statement above?
Thanks for your nice comment.
Pleased to meet you too
Is there any need to add comma after "you" in:
Pleased to meet you, too.
I wouldn't expect to hear "The pleasure is all mine" except on very formal occasions.
My preference would be for "Pleased to meet you too" - no comma. I don't like "Me too" but you might hear "You too" which is just a shortened form of "Pleased to meet you too".
The rather informal "Same here" or "Same for me" might be heard too but they're not very polite.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.