For the Purposes of the Statute of Frauds, Section 4

For the purposes of the Statute of Frauds, Section 4, is the requirement for a signature is met in any of the following scenarios?

A) The guarantor only initials the document.
B) The guarantee is contained in an email, and the guarantor has written his name in signing off the email.
C) The guarantor writes his name on the document to authenticate it.
D) The guarantee is contained in an email, and the guarantor's name is automatically inserted at the bottom of it.