Inactive Tutor answered 01/06/20
There are three things being considered here:
Is there one attorney or are there multiple attorneys?
Who does the signature belong to?
Do we need a comma?
The signature belongs to one attorney. Since there is only one attorney, the apostrophe goes before the s.
Lastly, is the phrase, “without the...signature” an introductory phrase? An introductory phrase doesn’t have a subject and a verb. This phrase has a subject, but it is missing a verb. So it is an introductory phrase and therefore needs a comma.
Now put the pieces together to choose the correct answer.