Which of the following is a non-verbal listening skill?

Mirroring the communicator is a non-verbal listening skill because it involves reflecting the behavior, emotions, or expressions of the person speaking, thus indicating attentiveness and empathy. This technique helps to create rapport and demonstrates that the listener is engaged with the speaker's message at a deeper level. Non-verbal cues, such as nodding, body language, and facial expressions, play a crucial role in effective communication, and mirroring is a powerful tool in this regard.

In contrast, probing questions and clarifying doubts are primarily verbal techniques that involve asking for more information or confirming understanding through spoken language. Taking notes, while it can aid in retention and understanding of the information being conveyed, is a method of recording verbal communication rather than a non-verbal skill itself. Therefore, mirroring stands out as the correct choice in identifying a non-verbal listening skill.