单项选择题

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单项选择题
It is a kind of online service system, on which you can publish and exchange information with others who also are the members of the system. On which you can paste your articles and answer the questions asked by the members of the system and you can also look for help here. It is
A．BBS
B．WWW
C．E-mail
D．TELNET
单项选择题
In the following statements about graph operations，which one is NOT correct
A．Finding critical path is an operation on directed graph
B．Finding critical path is an operation on undirected graph
C．Spanning tree of a graph may not be unique
D．Minimum spanning tree of a graph may not be unique
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