If $due_date contains a DateTime object for a date that comes 1 month
and 7 days before the date stored in the $current_date variable, what will $overdue_message contain
when this code finishes executing:
a. 0 years, 1 months, and 7 days overdue.
b. -0 years, -1 months, and -7 days overdue.
c. 1 month and 7 days overdue.
d. $overdue_message won’t be set because the if clause won’t be executed