Which function represents a parabola?
f left-parenthesis x right-parenthesis equals 3 minus x squared
x negative 2 negative 1 0 1 2
g left-parenthesis x right-parenthesis 8 5 4 5 8
f left-parenthesis x right-parenthesis only
g left-parenthesis x right-parenthesis only
both f left-parenthesis x right-parenthesis and g left-parenthesis x right-parenthesis
neither f left-parenthesis x right-parenthesis nor g left-parenthesis x right-parenthesis