If a Member of an LLC Executes a Personal Guarantee

If a member of an LLC executes a personal guarantee for the debt of an LLC,which of the following is true?

A) The personal guarantee would be unenforceable because it would circumvent the limited liability of the member.
B) The personal guarantee would result in personal liability of the member for any obligation of the LLC.
C) Because of the member's apparent authority,the personal guarantee would create liability for all other members if the LLC is a member-managed LLC.
D) The member will have personal liability according to the terms of the guarantee,but would not be personally liable for any other obligations of the LLC.