Which of the following would you use to detect when a Python script is being imported by another Python script?

a$.$ Organize the code in the Python script such that some statements are not placed inside any function, so that when the script is imported by another script, the code outside of any function will run.

b$.$ Define the following if statement so that the code outside the if statement within the Python script runs as expected as soon as the script is imported by another Python script:

c$.$ Organize the code in the Python script into functions so that when the script is imported by another script, the code inside the functions is only executed when the other script calls the functions.

d$.$ Define the following if statement so that the code inside the if statement will run when this script is imported by another Python script: