Why is scheduling overtime a popular choice for getting projects back on schedule?

Why is scheduling overtime a popular choice for getting projects back on schedule? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) ? If it involves hourly workers no direct costs are added to the project. ? Even if it involves additional costs, you minimize additional coordination and training costs. ? If it involves salaried workers, no direct costs are added to the project. ? It tends to avoid accidents, inferior performance, and turnover