$($b$)$ A software system is to be developed for a microprocessor$-$based Home Security Syslem $($HSS$).$ The system receives input from entry sensors$,$ smoke sensors$,$ temperature sensors and flood sensors$.$ The system is capable of generating alarms, turning on selected lights, and calling owner$-$specified phone numbers. The system is owner$-$ programmable through a keypad. The owner can set thresholds for the sensors$,$ program phone numbers and set delays for various alarms.

Using a function$-$oriented approach and Object$-$Oriented possible approaches, derive a design for the HSS described above. Make reasonable assumption and clearly state them.