A nurse is assessing a client who has Multiple Sclerosis. The client reports that, since the onset of the disease, there are times when their symptoms are active and then followed by a period with no symptoms. Which of the following types of Multiple Sclerosis does this pattern indicate?

A. Clinically isolating syndrome: Clinically isolated syndrome refers to a first episode of neurologic symptoms lasting at least 24 hours caused by inflammation or demyelination in the central nervous system. The pattern described involves repeated periods of symptom activity followed by remission, which extends beyond a single isolated event. B. Secondary progressive multiple sclerosis: Secondary progressive multiple sclerosis begins as relapsing-remitting disease but transitions into a phase of steady neurologic decline with or without superimposed relapses. The hallmark is progressive worsening rather than clearly defined symptom-free intervals. C. Primary progressive multiple sclerosis: Primary progressive multiple sclerosis is characterized by gradual neurologic decline from disease onset without distinct relapses or remissions. Symptoms steadily worsen over time due to ongoing demyelination and axonal loss. The absence of symptom-free periods distinguishes it from the pattern described. D. Relapsing-remitting multiple sclerosis: Relapsing-remitting multiple sclerosis involves clearly defined exacerbations of neurologic dysfunction followed by partial or complete recovery. During remission phases, symptoms may significantly improve or temporarily disappear. This cyclical pattern of relapse and remission aligns with the client’s report of active symptoms followed by symptom-free intervals.