Which of the following would be considered long-run choices? Which are short-run choices? Why?

a)A dentist hires a new part-time dental hygienist.

b)The local oil refinery plans a complete restructuring of its productionprocesses,including relocating the plant.

c)A farmer increases the quantity of water applied to his or her fields.

d)A law partnership signs a 3-year lease for an office complex.

e)The university hires a new football coach on a 3-year contract