What is the value of the discriminant, b^2 − 4ac, for the quadratic equation
0 = x^2 − 4x + 5, and what does it mean about the number of real solutions the equation has?

a.) the discriminant is −4, so the equation has 2 real solutions.
b.) the discriminant is −4, so the equation has no real solutions.
c.) the discriminant is 35, so the equation has 2 real solutions.
d.) the discriminant is 35, so the equation has no real solutions.