Simplify the expression: 72x5y8\sqrt{72x^5y^8}72x5y8 (assume x,y>0x, y > 0x,y>0)
6x2y42x6x^2y^4\sqrt{2x}6x2y42x
36x2y42x36x^2y^4\sqrt{2x}36x2y42x
6x2y426x^2y^4\sqrt{2}6x2y42
12x2y4x12x^2y^4\sqrt{x}12x2y4x