Correct option is (d) adjacency matrix
To explain: A graph can exist in different forms having the same number of vertices, edges and also the same edge connectivity, such graphs are called isomorphic graphs. Two graphs G1 and G2 are said to be isomorphic if −> 1) their number of components (vertices and edges) are same and 2) their edge connectivity is retained. Isomorphic graphs must have adjacency matrix representation.