A nurse is caring for a child who has increasing manifestations of fever, headache, stiff neck, and rash. Which of the following diagnostic tests should the nurse expect the health care provider to order?

A. CSF analysis is the primary diagnostic test for meningitis, which presents with fever, headache, stiff neck, and rash. B. The Glasgow Coma Scale (GCS) assesses consciousness but does not confirm the diagnosis of meningitis. C. An RBC count is unrelated to diagnosing meningitis. D. MRI can identify structural brain abnormalities but is not the first-line diagnostic test for meningitis.