Zidan is using the Rational Root Theorem to help find the roots of a 5th degree polynomial. He has discovered five roots and still has 4 to test. What is his next best step? 1 He should use the Factor Theorem to find the remaining polynomial roots.

2 He needs to pick one of the roots and use the quadratic formula to test it.

3 He should test the remaining 4 roots.

4 He can stop testing because he has found all the roots.