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A social network is modelled with people as vertices and friendships joining them. Each friendship is an:
AInverted array
BInternal loop
CIndex entry
DUndirected edge
Answer & Solution
Correct answer: D. Undirected edge
1. Friendship runs both ways.
2. It joins two vertices.
3. It is an undirected edge.
_Source: OpenStax Introduction to Computer Science, Chapter 3, Data Structures and Algorithms._
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