Which of the following best represents a hard technique?

A hard technique is characterized by physical actions that are more forceful and direct in nature, often employed to gain control over a situation or individual. Joint locks exemplify this concept as they involve applying leverage and pressure to an opponent's joints, effectively limiting their movement and controlling them without necessarily causing harm. This method relies on physical force and demonstrates a clear intent to subdue or incapacitate.

In contrast, verbal warnings, calm persuasion, and negotiation tactics are considered soft techniques. These approaches focus on communication and de-escalation rather than physical control. They aim to manage a situation through dialogue and psychological strategies, which do not entail the immediate physicality associated with hard techniques like joint locks. Therefore, joint locks stand out as the best representation of a hard technique due to their direct application and focus on physical restraint.