A resides in Taipei City, and M resides in Kaohsiung City. A and M jointly own and operate a private moving company, and do business in Taipei City. Knowing that M desired to get out of the business, A offered to purchase M's moving tools and truck. M accepted but later changed his mind and started up a new business in Kaohsiung City, leaving A with no operating equipment other than the expenses incurred. If there is a contract between A and M, which district court may Plaintiff A file a lawsuit against Defendant M pursuant to Article 12 of the Code of Civil Procedure?