Which of the following is an example of a bi-directional communication tool?

Email is an example of a bi-directional communication tool because it allows for both sending and receiving messages between parties. Unlike a brochure, which presents information in a one-way manner with no opportunity for feedback or response from the reader, email facilitates interactive communication. This means that when someone receives an email, they can reply directly, ask questions, and engage in a conversation, creating a dynamic exchange of information.

Similarly, a letter, while it can be responded to, typically does not allow for immediate or ongoing interaction, as it is often limited to the initial correspondence plus any replies that may follow. A phone call allows for real-time conversation, but it is typically transactional rather than allowing for a continuation of the communication thread over time. In contrast, email supports ongoing dialogue, archiving of messages, and the ability to share additional information easily, reinforcing its status as a bi-directional communication tool.