#21 Use the following query to answer the question below it: SELECT [Valid Patients).PAT_NAME, [Valid Patients).(Age Class]. PATIENT.HOME_PHONE FROM PATIENT INNER JOIN (SELECTV_PAT_FACT.PAT_ID "Patient ID", V_PAT_FACT.PAT_NAME "Patient Name", CASE WHEN V_PAT_FACT.AGE_YEARS >= 18 THEN 'Adult ELSE 'Ped' END "Age Class" FROM V_PAT_FACT WHERE V_PAT_FACT.IS_VALID_PAT_YN - YO) "Valid Patients" ON PATIENT.PAT_ID = [Valid Patients)."Patient ID Why does this query fail to run? SELECT ONE OF THE FOLLOWING (2 PTS) A. "Age Class" is invalid because subqueries cannot use CASE statements to define their columns B. "Valid Patients" is an invalid alias in the parent query's FROM clause C. The subquery does not make a PAT_NAME column available to the parent query D. The parent query does not reference each of the subquery's columns