(i) The given graph represents a function. The vertical line cuts the graph at most one point R.
(ii) The vertical line cuts the graph at most one point Q. The given graph represents a function.
(iii) The vertical line cuts the graph at A and B. The given graph does not represents a function.
(iv) The vertical line cuts the graph at A and B. The given graph does not represents a function.
(v) The vertical line cuts the graph at most one point R. The given graph represents a function.