The vertex of a parabola is at the point (3,1), and its focus is at (3,5). What function does the graph represent?
A. f(x)=1/16(x- 3)² - 1
B.
f(x)=1/4(x + 3)² - 1
c.
f(x)=1/4(x - 3)² - 1
D.
f(x)=1/16(x - 3)² + 1