Which of the following is NOT one of the five basic fundamentals that commanders and leaders must use?

The option that identifies the element not included among the five basic fundamentals that commanders and leaders must use is correct. The five basic fundamentals focus on essential operational activities that support unit effectiveness in achieving mission success. These include critical actions such as moving troops strategically, maintaining effective communication with team members and other stakeholders, and ensuring sustained operations through supply and logistical support.

Negotiation, while a valuable skill in certain contexts, does not specifically fall within the core fundamentals necessary for commanders and leaders when training and conducting military operations. The primary focus for leaders is on executing movement, fostering communication, and ensuring sustainability, which are vital to maintain operational readiness and effectiveness in various scenarios encountered in the field.