1.

A vertex cover of an undirected graph G(V, E) is a subset V1 ? V vertices such that

A. Each pair of vertices in V1 is connected by an edge
B. If (u, v) ? E then u ? V1 and v ? V1
C. If (u, v) ? E then u ? V1 or v ? V1
D. All pairs of vertices in V1 are not connected by an edge
Answer» D. All pairs of vertices in V1 are not connected by an edge


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