HEL M PPEOP The graph of function `f\left(x\right)=-x^{2}+2x+3` is shown on the left. Select all statements that are true.

1.The vertex is at the maximum.
2.The vertex form of the function is f(x)=-(x+1)^2+4
3.The function is positive over the interval -1 1
5.As x approaches positive infinity, the function f(x) decreases.