A straight line L is perpendicular to the line `4x-2y=1` and forms a triangle of area 4 sq.units with coordinate axes then, the equation of L is (i) `2x+4y+8=0` (ii) `2x-4y+8=0` (iii) `2x+4y+7=0` (iv) `4x-2y-7=0`