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【单选题】
假定系统有三个进程P1、P2和P3，共有6台磁带机。进程P1总共要求5台磁带机，P2和P3则分别要求23台。假设在T时刻，进程P1、P2和P3已分别获得2台、12台磁带机，那么在T时刻能够找到的不同的安全分配序列个数是( )。
A.
0
B.
1
C.
2
D.
3
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举一反三
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