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【单选题】
以下关于 ref 和 out 的描述哪些项是不正确的A.
ref 和 out 参数传递方法相同，都是把实在参数的内存地址传递给方法，实参与形参指向同一个内存存储区域，但 ref 要求实参必须在调用之前明确赋过值。
B.
ref 是将实参传入形参， out 只能用于从方法中传出值，而不能从方法调用出接收实参数据
C.
ref 和 out 参数要求实参和形参的数据类型的数据类型必须一致，或者实参能被隐式地转化为形参。
D.
ref 和 out 参数传递的是实参的地址所以要求实参和形参的数据类型必须一致。
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