Fiesta Expeditions sells adventure vacations in South America. Fiesta's success is based on repeat business and referrals. Sales staff are evaluated monthly on their performance and receive a bonus for exceeding targets. Targets are set individually based on the staff member's geographical area, the season, and current market trends, such as the strength of the economy. Performance metrics relate to the number of trips sold, number of person-days of expeditions sold, and profit generated. How would Fiesta's performance metrics best be classified?

a) Comprehensive but not controllable b) Neither comprehensive nor controllable c) Comprehensive and controllable d) Controllable but not comprehensive