The vertices of a rhombus are (-5,0), (0,8), (5,0), and (0,-8) The product of the lengths of its diagonals is
AOBC is a rectangle whose three vertices are A(0, 3), O(0, 0) and B(5, 0). The length of each of its diagonals is
(a) 5 units (b) 3 units (c) 4 units (d) √34 units