Yolanda and Zachary decided to restructure their small bookstore as a limited partnership, called "Y to Z's Books, LP." Under their new arrangement, Yolanda contributed a new infusion of $300; she was named the general partner. Zachary contributed $300 also, and he was named the limited partner: Yolanda was to manage the store on Monday, Wednesday, and Friday, and Zachary to manage it on Tuesday, Thursday,and Saturday. Y to Z Books, LP failed to pay $800 owing to Vendor. Moreover, within a few weeks, Y to Z's Books became insolvent.

Who is liable for the damages to Vendor?