Which technique refers to "Son Nal Mak Ki"?

The term "Son Nal Mak Ki" refers specifically to the knife hand block technique used in martial arts, particularly in Taekwondo. This technique utilizes the edge of the hand, specifically the knife edge, to deflect an incoming attack. It is effective in blocking strikes, especially to the head or upper body, and can also be transitioned into counterattacks due to its angular movement and positioning.

The knife hand block is characterized by its unique hand positioning and requires specific movements that enhance both defensive and offensive capabilities in sparring or self-defense. This technique is not simply about blocking; it involves precision and control, making it an essential part of sparring strategies.

The other options represent different blocking techniques that use varying parts of the arm or hand and have distinct forms, each designed for specific types of strikes. However, they do not align with the definition of "Son Nal Mak Ki," which clearly signifies the use of the knife hand for blocking.