The appropriate ways to collaborate with your peers online from the options provided are:
- Join or form a project discussion group.
- Attend a web conference with project team members.
- Use a video tool to have a face-to-face discussion over the Internet.
The option to "Write in your personal online diary" is typically a solitary activity and doesn't involve collaboration with peers. The option to "Take another student’s assignment and add your name" is unethical and does not constitute collaboration.