海明码是一种纠错码，其方法是为需要校验的数据位增加若干校验位，使得校验位的值决定于某些被校位的数据，当被校数据出错时，可根据校验位的值的变化找到出错位，从而纠正错误。对于32位的数据，至少需要增加（ ）个校验位才能构成海明码。
以10位数据为例，其海明码表示为D9D8D7D6D5D4P4D3D2D1P3D0P2P1中，其中Di（0≤i≤9）表示数据位，Pj（1≤j≤4）表示校验位，数据位D9由P4、P3和P2进行校验（从右至左D9的位序为14，即等于8+4+2，因此用第8位的P4、第4位的P3和第2位的P2校验），数据位D5由（ ）进行校验。
问题1选项
A.3
B.4
C.5
D.6
问题2选项
A.P4P1
B.P4P2
C.P4P3P1
D.P3P2P1
正确答案及解析
正确答案
解析
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