Select the statements that accurately describe cerebrospinal fluid (CSF) or its functions in the central nervous system (CNS).
A. CSF removes waste from the CNS.
B. CSF is the primary immune defense in the CNS.
C. CSF provides buoyancy that allows the brain to float in the skull.
D. CSF is a clear, water‑like fluid that circulates in and around the brain and spinal cord.
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