Which of the following interventions is appropriate for a child with systemic lupus erythematosus (SLE)?

A. A high-protein/high-fat diet may exacerbate inflammation rather than reduce it. B. Regular physical activity promotes joint function and can support general well-being in children with SLE. C. Live vaccines are contraindicated in immunocompromised patients with SLE due to infection risk. D. Sun exposure without protection can exacerbate SLE symptoms due to photosensitivity.