Which tool works best when passively observing and assisting a remote user as that user attempts to learn a new program while still providing interactive assistance when necessary?

Mariah was working on a multimedia presentation that included both video and audio files. the file was huge, and she wanted to send it to her coworker in another office. she needed to reduce the size of the file so that it could be transmitted faster. the utility she used to do this was

How do you know if the website is secure if you make a purchase

Which two technologies support the building of single-page applications?