Which scenario best illustrates an appropriate use of "asynchronous" collaboration tools rather than synchronous ones in a distributed team?

A Holding a live video call that requires every team member to attend at the same exact moment regardless of their time zone B Sending an instant message and expecting an immediate reply within seconds C Recording a video walkthrough of a feature so teammates in different time zones can review it whenever convenient D Hosting a real-time pair-programming session that needs both participants online simultaneously