Which one of the following best exemplifies the principal-agent problem in the employer-employee relationship? Multiple

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Which one of the following best exemplifies the principal-agent
problem in the employer-employee relationship?
Multiple Choice
A worker takes 20-minute coffee breaks although the employer
allots only 15 minutes for this purpose.
A worker is on the job 50 hours per week although only 40 hours
are required for promotion.
A worker opts for early retirement in response to the firm's
incentive plan.
A worker's productivity is independent of the wage paid.