When a thank you phrase is followed by an independent sentence that is related to the thanking part, what is the correct and most proper punctuation to use?
There are many possible ones to apply; thus I have chosen the most three in which I think can state correct punctuation:
1- Thank you, it was very helpful!
2- Thank you! It was very helpful.
3- Thank you; it was very helpful.
It doesn't, of course, have to be "Thank you", it may also be:
Thanks - Thank you for what you did - Thanks a lot - Thank you very much - ...etc
I have searched about this matter, but the results I got were all about whether to add a comma after "Thanks" in emails or not. One of the searches
I also think it may be only a matter of style, so if that is the case, then what would a grammarian use?
Note: I would further like to know the formal and informal way of stating the punctuation.