The correct answer is B) Operational control, safety control, and monitoring. In a gas turbine propulsion installation, the typical control system is designed to perform three main functions: operational control, safety control, and monitoring. The operational control ensures the proper functioning of the gas turbine, regulating parameters such as fuel supply, air intake, and power output. The safety control system monitors critical parameters and triggers automatic shutdown or emergency procedures in case of any abnormal conditions, ensuring the safe operation of the gas turbine. The monitoring function provides real-time data and information about the system's performance, allowing the operator to assess the overall condition and make informed decisions. The other answer choices are incorrect because they do not accurately represent the primary functions of a gas turbine propulsion control system. Answer A focuses on operational control, speed control, and braking, which are not the key functions of a typical gas turbine control system. Answer C describes the types of control systems (pneumatic, hydraulic, and electric), rather than the specific functions performed. Answer D mentions pneumatic control, electric control, and monitoring, but does not include the critical safety control aspect.