Please help me see what is the problem, no matter that character or number I entered, the program also display Invalid Option.Code:#include <stdio.h> char option; void PURCHASE(), VIEW(), QUIT(); void BUSINESS(), ECONOMY(); void main(){ printf("AIRLINE RESERVATION SYSTEM \n"); printf("P - to Purchase Ticket \n"); printf("V - to View Arrangement \n"); printf("Q - to Quit the system \n"); printf("Enter the option : "); scanf_s("%c", &option); getchar(); switch(option){ case '1': case 'P': case 'p': printf("Purchase\n"); //PURCHASE(); break; case '2': case 'V': case 'v': printf("View\n"); //VIEW(); break; case '3': case 'Q': case 'q': printf("Quit\n"); //QUIT(); break; default: printf("Invalid Option \n"); break; } }