Hand-trace the following code. What is the output, or what error/problem do you observe and why?

Styles 3) (5 points) def main(): num1 = 10 num2 15 result print(result) add() def add(numi, num2): return num1 + num2 main() 1 4) (5 points) def main(): result square(6) print('square(6):', result) def square(number): return number ** 2 main() # execution begins here #when main returns, the script terminates here