Which of the following statements are true of the discriminant?

a: the discriminant is b^2 – 4ac in the quadratic formula.
b: the discriminant is the denominator in the quadratic formula.
c: the discriminant is the radicand of the quadratic formula.
d: the discriminant is the value under the radical in the quadratic formula.
e: the discriminant is the value in front of the radical in the quadratic formula.