Please help!

The vertex of a parabola is (3,0) and a= -1. Which of the following functions represents the parabola?

A. y= -x^2 + 3
B. y= x^2 - x + 3
C. y= -x^2 + 6x -9
D. y= x^2 - 6x + 9

Which best describes a central bank's primary goals? limiting inflation and reducing unemployment reducing unemployment and maintaining cash flow controlling stagflation and reducing unemployment managing credit and ensuring the money supply's liquidity