Metal Smelting Inc operates a plant-a major source-that releases hazardous air pollutants for which the Environmental Protection Agency has set maximum levels of emission. The plant doesn't use any equipment to reduce its emissions. Under the Clean Air Act this is utmost likely
a) A violation.
b) Not a violation because a major source is exempt.
c) Not a violation because the plant doesn't use any equipment.
d) Not a violation for the reason that the plant isn't a mobile source.