A workshop produces stools (x) and desks (y). Each stool uses 2 hours and each desk uses 5 hours of carpentry time. At most 200 carpentry hours are available in a week. Which inequality models this limitation?
a) 5x+2y≤200
b) 2x+5y≥200
c) 2x+5y≤200
d) 2x+5y=200