Which of the following statements is $($are$)$ true?

Group of answer choices

Practical standards are also known as attainable standards

Behavioral scientists find that perfection standards often discourage employees and result in low worker morale

Behavioral scientists find that perfection standards often discourage employees and result in low worker morale;

Practical standards are also known as attainable standards;

Practical standards incorporate a certain amount of inefficiency such as that caused by an occasional machine breakdown

Practical standards incorporate a certain amount of inefficiency such as that caused by an occasional machine breakdown

Practical standards are also known as attainable standards AND practical standards incorporate a certain amount of inefficiency such as that caused by an occasional machine breakdown