Which statement best distinguishes 'essential functions' from 'marginal tasks'?

Which statement best distinguishes 'essential functions' from 'marginal tasks'?

• A. Essential functions are the core duties; marginal tasks are incidental duties not central to the job.
• B. Essential functions are always performed by all staff; marginal tasks by management only.
• C. Essential functions can be ignored if there are high sales; marginal tasks are core.
• D. Essential functions refer to tasks outside the job description.

Answer: (A)