Which of the following is not an example of synchronous communication?

You send a text while watching a video$-$conference presentation.

You IM the corporate delivery service while talking to a customer about his missing delivery.

You deliver a speech with PowerPoint slides while watching the reaction of your manager out of the corner of your eye.

You read email with both text and video components open at the same time.

You attend a web seminar while forwarding slides to a coworker who is not participating in the seminar.