Let a,b and c be real numbers.Then the fourth degree polynomial in x acx^4 + b(a+c)x^3+(a^2+b^2+c^2)x^2+b(a+c)x+ac

1) has 4 complex (non-real) roots
2) has either four real roots or four complex roots
3) has two real roots and two complex roots
4) has four real roots