A clique in a graph is a subgraph where every pair of distinct vertices is adjacent to each other.
Therefore, a subgraph \( H \) of graph \( G \) is called a clique if \( H \) is a complete graph. In a complete graph, every vertex is connected to every other vertex. This is the defining characteristic of a clique.
Therefore, option (4) is correct.
What are the in-degree and out-degree of vertex 4? 
The supply voltage magnitude \( |V| \) of the circuit shown below is ____ .
A two-port network is defined by the relation
\(\text{I}_1 = 5V_1 + 3V_2 \)
\(\text{I}_2 = 2V_1 - 7V_2 \)
The value of \( Z_{12} \) is: