Going over a course Review for Federal Real Property Lease Law and want to get a double check and see if i come up with the same answer: (Thank you in advance as this online learning experience was extremely difficult to follow along and confusing).

Which of the following examples are methods that are commonly employed by the courts and boards of contract appeals in reaching a decision

1 following precendent and invoking the doctrine of waiver

2 following precedent distinguishing a case based upon the facts, and invoking the doctrine

3 following precedent overruling a previous case, and invoking the doctrine of waiver

4 following prescent overruling a previous case, distingquishing a case based on the facts, and at times simply ignoring a previous ruling