How could the following line of code be shortened? average = average + 1

Group of answer choices:

1.average + a

2.average += 1

3.average = + 1

4.average = 1 + average

1. how do you view the edited document without the track changes markup? a. select accept all changes in document in the accept drop-down menu. b. click on restrict editing in the protect group. c. click on the reviewing pane drop-down menu in the tracking group. d. click on final in the display for review drop-down menu.