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【单选题】
(1). 求从指定源点到其余各顶点的杰斯特拉（Dijkstra）最短路径算法中弧上权不能为负的原因是在实际应用中无意义；(2). 利用Dijkstra求每一对不同顶点之间的最短路径的算法时间是O(n3 ) ；（图用邻接矩阵表示）(3). Floyd求每对不同顶点对的算法中允许弧上的，但不能有权和为负的回路。上面描述不正确的是（ ）。
A.
(1),(2),(3)
B.
(1)
C.
(1),(3)
D.
(2),(3)
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