Consider the following utility functions. G(x,y) = x2 (1+ y) H (x,y) = In(x) + In(2y) +20 L ( X , y ) = ( * + 1) 1/2 + ( * + 1 ) 1/2 U ( x,y ) = ext y W(x,y) = 30x - 4x2 + 4y Z( x,y) = x1/2 y Which function or functions are homothetic? Select one or more: O a. W O b. U OCL O d. G O e. None. Of.z D g. H