A 9 year old boy sustains a fracture of the crown of his central incisor with minimal pulp exposure. The accident occurred one hour prior. A periapical radiograph reveals that the root of the tooth is intact but the apex is open. The most appropriate treatment is to

perform a pulpectomy and seal temporarily

pulp cap with calcium hydroxide and restore

perform a pulpotomy and seal temporarily

perform a pulpectomy and fill immediately with gutta-percha and restore