For Any Given Output Level,a Firm's Long-Run Costs

Multiple Choice

For any given output level,a firm's long-run costs

A) are always greater than or equal to its short-run costs.
B) are usually greater than or equal to its short-run costs except in the case of diminishing returns to scale.
C) are always less than or equal to its short-run costs.
D) are usually less than or equal to its short-run costs except in the case of diminishing returns to scale.