Write a code in the main function that would call Function 1 and Function 3 of the Lab class. You can use values of your choice for function arguments (if required). Please write the output of these function calls. class Lab {    int time; public:    Lab(){                                                //Function 1        time = 120;        cout << "Duration of lab is " << time << “minutes” << endl;    }    void Demonstration(){                                 //Function 2        cout << "Lab Demonstration started." << endl;    }    Lab(int duration){                                    //Function 3        time = duration;        cout << "Duration of lab is " << time << “minutes” << endl;    }    ~Lab(){                                               //Function 4        cout << "Thanks. Lab has ended." << endl;    }

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Types of Function

A function is a process or task that does some operation in the program. Some programming languages may contain built-in functions for certain commonly used tasks. Most programming languages also support user-defined functions, which means a user can write their own function to perform some operation. There are some libraries or header files that contain built-in functions for performing certain tasks.