If f'(1) =0 and f''(1)=-3 which of the statement is true ? 1. F(x) must Have a relative maximum At x=1 2. F(x) Must have a relative minimum at x=1 3. F(x) must be concave up at x=1 4. F(x) Must be concave down at x=1 5. The tangent line to the graph of f(x) at x=1 must be horizontal