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【单选题】
优先编码器的编码信号是相互排斥的,不允许多个编码信号同时有效。 对于 8421BCD 码优先编码器,下面说法正确的是( )A.
有 10 根输入线， 4 根输出线
B.
有 16 根输入线， 4 根输出线
C.
有 4 根输入线， 16 根输出线
D.
有 4 根输入线， 10 根输出线
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