Which of the following is an example of cyberharassment?a. Someone sends you a credible threat that they are "out to get you."b. Someone posts a strongly worded dissenting opinion to your post on a social network. c. An unknown individual posts photos of you, taken over several days in different locations, without you being aware that your photo was taken. d. Someone keeps sending you instant messages after you have asked them to stop.

In many applications, only a small percentage of the points in a given set p of n points are extreme. in such a case, the convex hull of p has less than n vertices. this can actually make our algorithm convexhull run faster than θ(nlogn). assume, for instance, that the expected number of extreme points in a random sample of p of size r is o(rα ), for some constant α < 1. (this is true when the set p has been created by picking points uniformly at random in a ball.) prove that under this condition, the running time of the algorithm is o(n).