Which two methods are commonly used to deliver strikes?

The correct choice highlights two techniques that are specifically recognized for their effectiveness in delivering strikes within defensive tactics. Penetration refers to a striking method aimed at getting through an opponent's defenses, delivering power directly to the target by focusing force. This approach is beneficial in self-defense situations where neutralizing a threat quickly is essential. Snap-back, on the other hand, involves a quick retraction of a limb after delivering a strike, which helps maintain balance, prepares the individual for follow-up actions, and reduces the risk of counter-strikes from the opponent.

These methods fit well within the principles of effective striking as they emphasize both intent and control, making them valuable for trainees in defensive tactics. The other choices involve actions that do not align with the specific techniques typically taught for delivering effective strikes in combat or self-defense scenarios.