A factory manufactures sets of training suits that include pants and a jacket. The daily cost to produce x jackets are modeled by the function j(x)=0.5x²−14x+60. The daily cost to manufacture x pants is modeled by p(x)=0.5x²−8x+40. Which function could be used to model the daily cost C(x) to manufacture x sets (jacket and pants)?
a) C(x)=j(x)+p(x)
b) C(x)=j(x)−p(x)
c) C(x)=j(x)×p(x)
d) C(x)=j(x)/p(x)