Mark all of the following that are true: If the discriminant is negative, then there is no real solution
If the discriminant is O, then there is no real solution
If the discriminant is negative, then there are two real solutions
If the discriminant is positive, then there can be either 1 or 2 real solutions
If the discriminant is o, then there is only one real solution
If the discriminant is a positive number, there are two real solutions