Suppose a firm can produce 70 units of a product, Zenia, by combining labor, land, capital, and entrepreneurial ability, as in the four alternative techniques shown in the table below. Assume further that the firm can hire labor at $3 per unit, land at $3 per unit, capital at $6 per unit, and entrepreneurship at $9 per unit. 
Refer to the above table. Which technique is the most economically efficient way of producing Zenia?
Definitions:
Autonomic Nerves
Nerves that control involuntary functions in the body, such as heart rate, digestion, and respiratory rate.
Peripheral Nervous System
That part of the nervous system that lies outside the brain and spinal cord, which includes the nerves that extend to the limbs, organs, and the body's periphery.
Central Nervous System
The part of the nervous system consisting of the brain and spinal cord, responsible for processing and sending out information throughout the body.
Endocrine System
A system of glands that secrete hormones into the bloodstream, regulating processes such as growth, metabolism, and mood.
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