The co-ordinate of the vertices of the rectangular hyperbola $xy=16$ are

Question

$$\begin{array}{1 1}(1)(4 ,4 )(-4 ,-4)&(2)(2 ,8 )(-2 , -8 )\\(3)(4 ,0 )(-4 , 0 )&(4)(8 , 0 )(-8 , 0)\end{array}$$