Please select a correct output from the following statements:

# The main function for this program.

def main$)$:

print$(\text{'}$Welcome to my program.$\text{'})$

greet$\_$by$\_$name$()$

print$($it$\backslash \text{'}$s great to meet you!$\text{'})$

# A function that says hello to a user

def greet$\_$by$\_$name$)$:

print$(\text{'}$Hello Heejun Kim!"$)$

# Call main function to start the program.

main$()$

main