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What does the term minimumefficientscale mean?

a$.$ The largest$-$size plant capable of achieving minimum long$-$run average cost.

b$.$ The lowest average cost of production for a particular size of plant.

c$.$ The smallest size of plant capable of producing a particular output.

d$.$ The lowest level of efficiency which a firm is capable of producing.

e$.$ The smallest$-$size plant capable of achieving minimum long$-$run average cost.