Q4. A proprietary fire alarm/ detection system is installed in a large shopping mall. (a) With a simple block diagram, explain the key features and functions of the proprietary fire alarm/detection system for a large local shopping mall. (12 marks) (b) Discuss with examples, the possible causes of false fire alarm problems in a large shopping mall. Suggest remedial actions to the building management for minimizing the false fire alarm problem. (13 marks)