Since the program is set in such a way that the functions are called directly from the main function multiple times and there is no special mention of any class or object, the type of programming language used by the production line is a structured programming language.
Explanation:
In a structured programming language, all the tasks are performed by different functions.
There are no things such as classes, objects, and access specifiers in structured programming and importance are given to functions and sequences of actions to be taken.
Another name for structured programming is procedure-oriented programming. It follows a top-down approach.