\#22 The HOME PHONE column stores a patient's home phone number if it exists. Otherwise, it stores NULL. The WORK PHONE column stores a patient's work phone number if it exists. Otherwise, it stores NULL Which SQL expression retums the patient's home phone number if it exists, the work phone number only if the home phone number doesn't exist, and NULL when neither exists? SELECT ONE OF THE FOLLOWING (1 PT) A. CONCAT (HOME_PHONE, WORK PHONE, NULL) B. HOME_PHONE II WORK_PHONE II NULL C. COALESCE( HOME PHONE, WORK PHONE) D. CAST (HOME_PHONE, WORK_PHONE, NULL)