The function fff is given in three equivalent forms. Which form most quickly reveals the vertex? Choose 1 Choose 1

(Choice A, Checked)
A
f(x)=-3x^2+12x+15f(x)=−3x
2
+12x+15f, left parenthesis, x, right parenthesis, equals, minus, 3, x, squared, plus, 12, x, plus, 15

(Choice B)
B
f(x)=-3(x-2)^2+27f(x)=−3(x−2)
2
+27f, left parenthesis, x, right parenthesis, equals, minus, 3, left parenthesis, x, minus, 2, right parenthesis, squared, plus, 27

(Choice C)
C
f(x)=-3(x+1)(x-5)f(x)=−3(x+1)(x−5)f , left parenthesis, x, right parenthesis, equals, minus, 3, left parenthesis, x, plus, 1, right parenthesis, left parenthesis, x, minus, 5, right parenthesis
What is the vertex?
Vertex = ((left parenthesis
,,comma
))right parenthesis