Let $A ( h , k ) , B ( 1,1 )$ and $C ( 2,1 )$ be the vertices of a right angled triangle with $A C$ as its hypotenuse. If the area of the triangle is 1 , then the set of values which ' k ' can take is given by\\
(1) $\{ 1,3 \}$\\
(2) $\{ 0,2 \}$\\
(3) $\{ - 1,3 \}$\\
(4) $\{ - 3 , - 2 \}$