We are in the process of building a 6000 square feet two story building. The first floor, 3000 square feet, will have a classification as Business Group B consisting of office space. The upstairs is classified as Residential R-3. A one hour fire rated ceiling will separate the first and the second story and a one hour fire rated wall will separate the two dwellings upstairs. What areas need to be sprinkled and what NFPA sprinkler system can I use? NFPA 13, 13R, or 13D? I appreciate your input.