4. : Identify and correct the errors in each of the following statements. (Note: There may be more than one error.) (20 points) a) int sum( int x, int y ) { int result; } b) while result = x + y; ( (Z >= 0 ) sum += 2; c) switch (n) { case 1: } printf("The number is 1 "); case 2: printf("The number is 2 "); break; default: printf("The number is not 1 or 2 " ); break; } d) void product(void) { int a, b, c, result; printf("Enter three integers: ") scanf("%d %d %d", &a, &b, &c ); result = a*b*c; printf("Result is %d", result); return result;