6.Janetconsumesgood1andgood2togetherinfixedproportions.Shealwaysconsumes2 unitsofgood1foreveryunitgood2.Oneutilityfunctionthatdescribesherpreferencesis a)u(x1,x2)=2x1x2. b)u(x1,x2)=min{2x1,x2}. c)u(x1,x2)=2x1+x2. d)u(x1,x2)=min{x1,2x2}