Once you've connected to a data source, which button would you select to add a first name to your form letter? a. insert merge field b. highlight merge fields c. address block d. greeting line

1. define independent-set as the problem that takes a graph g and an integer k and asks whether g contains an independent set of vertices of size k. that is, g contains a set i of vertices of size k such that, for any v and w in i, there is no edge (v,w) in g. show that independent-set is np-complete.