Question on accepted risk

Q: While monitoring project risk, you find that an accepted risk is going to occur. Which of the following will you use to develop response?

A: Risk response plan

B: Fallback plan

C: Mitigation plan

D: Risk register

 

Two seperate sources have two different answers so it is confusing.

B: Fallback plan

I thought of option b as well but one explaination says we develop risk response plan to counter any risk happening. Hence during planning, risk response plan is developed and used during m&c... However other explaination says since it is an accepted risk, we have a fall back plan for it so we use that.

Still confusing as both explainations seem justified.

C. mitigation plan 

its acceptable one

 

As it is identified risk so to counter the identified risk we will refer the response plan.

So, my answer is - A

How to response a risk like plan -B, mitigate etc will be in Risk response plan. Pl. clarify if I am wrong .