Good X and good Y are perfect complements for Zara. For every 4.7 units of good X, Zara must have 6.3 units of good Y, otherwise an amount of one of the two goods can be thrown away without decreasing Zara's utility. Which of the following functions, if any, represents Zara's utility function?

Select all that apply.

a.None.

b.S=4 min(6.3x,4.7y)-60

c.U=min(4.7x,6.3y)

d.T=ln(min(4.7x,6.3y))

e.Z=min(4.7x,6.3y)+10

f.V=-1/(min(6.3x,4.7y)+3)

g.W=min(6.3x,4.7y)