Which subject area describes collecting and analyzing data from computer systems, networks, and storage devices, as part of an investigation of alleged illegal activity?

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.