Factorise 4xy2 – x3 – yx2 + 4y3 completely.
\( (x+y)(2y+x)(2y-x)\)
\( 2xy(x+y)(2y-x)\)
\( (2y-x)^2 (x+y)\)
\( (x+y)(x-y)(2y-x)\)
