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【单选题】
如果网桥通过端口X接收到源MAC地址为S，目的MAC地址为D的MAC帧，R=（MAC地址，端口，定时器）是转发项，其中定时器给出转发项没有更新的时间，因此，新创建转发项的初始定时器值为0，以下哪一个操作是错误的。
A.
如果 MAC 表中找不到 MAC 地址等于 S 的转发项，增加转发项（ S,X,0 ）
B.
如果 MAC 表中存在转发项（ S,Y,20 ），该转发为（ S,X,0 ）
C.
如果 MAC 表中存在转发项（ S,X,20 ），该转发为（ S,X,0 ）
D.
如果 MAC 表中找不到 MAC 地址等于 D 的转发项，增加转发项（ D,X,0 ）
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