已知信道的转移概率矩阵为 ，则该信道的2次扩展信道容量为

A、log4+0.1log0.1+0.3log0.3+0.3log0.3+0.3log0.3;

B、log4-(0.1log0.1+0.3log0.3+0.3log0.3+0.3log0.3);

C、2* (log4+0.1log0.1+0.3log0.3+0.3log0.3+0.3log0.3);

D、2*[log4-(0.1log0.1+0.3log0.3+0.3log0.3+0.3log0.3)]