Refer to the above table. Suppose Airbus is set to produce the aircraft before Boeing. Which company will enter the market?

If a firm decides to produce no output in the short run, its costs will be:

A. its marginal costs. B. its variable costs. C. its fixed costs. D. zero.

At any level of a mining firm's output, total cost will be equal to extraction costs:

A. Plus user costs B. Minus user costs C. Times user costs D. Divided by user costs