$[5]$ Textbook, Ch$.1,$ Exercise $9.$ In an embedded application, a C program often ha endless loop $($i$.$e$.,$ dead loop$),$ such as "while $(1)$;$"$ at the end of the main $()$ fut Why?

a$.$ It prevents the program from exiting accidentally, as an embedded application never exit.

b$.$ It allows the processor to stay idle to improve energy efficiency.

c$.$ It is to initialize the stack.

d$.$ It is a mistake since every program should exit and return to operating syste