Which of the following best describes the focus of a parabola?
A. A single fixed point that is half the distance from the parabola as
the directrix is from the parabola
B. A single line that is half the distance from the parabola as the
directrix is from the parabola
C. A single line that is the same distance from the parabola as the
directrix is from the parabola
O D. A single fixed point that
is the same distance from the parabola as
the directrix is from the parabola

someone helpp asap plss