What are the two types of defensive sprays mentioned?

The selection of First Defence Mk3 and Mk6 0.4% as the correct answer highlights the specific types of defensive sprays that are often utilized in safety and law enforcement contexts. These sprays are classified as "defensive" due to their formulations designed to immobilize or deter an aggressor while minimizing long-term harm.

First Defence sprays, commonly based on oleoresin capsicum (OC), are considered effective because they can temporarily incapacitate a threat through intense irritation of the eyes, respiratory system, and skin, allowing for an escape or a chance to call for help. The specific percentage mentioned (0.4%) indicates the potency of the active ingredient, which is crucial in determining its effectiveness and safety level compared to other formulations.

Understanding these specific products is essential for individuals in safety-related roles, as it informs proper usage and ensures compliance with safety standards.