B is the correct answer not totally sure tho hope this helps
It is number 3. Have a good day.
I agree with the second answer. Was this correct?
Answer:

Step-by-step explanation:
Given

Required
The inverse

Replace f(n) with y

Swap positions of y and n

Make y the subject

Replace y with f'(n)

It’s C I believe
I hope it helps you with it