Please help me to choose he best answer for each question. Thank you!

Which one of the following is NOT a way to improve the P/Q rating of a company's UAV drones? O Adding better and more functional obstacle sensors O Increasing annual expenditures for drone R&D O Adding one or two more extra performance features Improving the battery compartment to permit more batteries and longer flying time O Improving rotor performance and the functions/quality of the flight controller