Answer:Yes this is an Incidental violations
Explanation:Incidental violations refers to unintended disclosure of private data that may take place whilst people are just carrying on with their daily work activities which is permitted like Martha and Kelly are actual doing their work and that is allowed however another person heard their conversation eventhough they didn't intend to make this person hear their conversation. This was unintended so it is referred to as incidental violation.
Precautions that can be taken to avoid incidental violation are, using a low and soft voice when discussing private information and using a more private space