Which of the Following Are the Dominant Job Redesign Approaches

Which of the following are the dominant job redesign approaches since the 1940s?

A) Job rotation: moving the worker among different jobs with few tasks or activities.
B) Job enlargement: adding duties and tasks to a job to make it larger.
C) Job enrichment: adding duties and tasks but also adding more autonomy and responsibility to a job.
D) All answers are correct.