题目内容
（请给出正确答案）
[主观题]
以下SQL语句正确的有()。
以下SQL语句正确的有（)。
A、SELECT cust_id FROM Orders WHERE order_num IN (SELECT cust_id FROM OrderItems WHERE prod_id ='RGAN01')
B、SELECT cust_id FROM Orders WHERE order_num IN (SELECT order_num FROM OrderItems WHERE prod_id ='RGAN01')
C、SELECT * FROM Orders WHERE cust_id IN (SELECT cust_id FROM OrderItems WHERE prod_id = 'RGAN01')
D、SELECT * FROM Orders WHERE cust_id IN (SELECT order_num FROM OrderItems WHERE prod_id ='RGAN01')
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