The answer to this question is #2
There is RRMS SPMS PPMS and PRMS the least common is PRMS
I am pretty sure it is D
I hope this helps you !!
Answer: The method used would be a clinical study design.
Explanation:
The clinical study design - This can be defined as research studies which involve the formulation of trials and experiments. The clinical study design can be seen as observational studies in medical, clinical and other types of research involving human beings
