answer questions b) and c). 

1-3 (2%) Consider the following two networks: 1 3 2 3 4 5 1 2 3 4 5 (a) (b) Network (a) is directed; network (b) is undirected but bipartite. Write down: a) the adjacency matrix of network (a); b) the incidence matrix of network (b); c) the one-mode projection matrix for network (b) onto its black nodes. (Hint: you may either use linear algebra, or consider intuitively, e.g., black nodes #1 and #3 are connected by white node #1, so there are corresponding non-zero elements there.)