Which of these following is an example of a network effect? [Select all that apply]

1. Using MS word to write your research paper.

2.On your flight from EWR to Miami, get an upgrade to business class because the airline overbooked economy class.

3. Playing FIFA-22 (a video game) multiplayer online.

4. Sending money to your friend using Venmo

5. Using email to discuss the progress of your project with your group members.