A manufacturing plant produces three product lines in one of its plants: A, B, and C. Each product line has multiple models: 8 models within product line A, 5 models within B, and 2 within C. Total annual production quantity of all models of product A is 2000 units, 2100 units for product B, and 900 units for product C. Determine the number of (a) different product models and (b) total quantity of products produced annually in this plant.