Are

are

A) computer-based networks that trigger actions by sensing changes in the real or digital world.
B) software programs to measure the number of times an ad loads on a webpage.
C) small, downloadable software programs that can run on tablet devices or smartphones to provide special functions for these devices.
D) a failed marketing gimmick to advertise the benefits of smartphones.
E) programs that can be used to organize large groups to form protests on social networking sites.