Which of the following describes the "fundamentals" in breaching operations?

The choice identifying the "fundamentals" in breaching operations is indeed basic engineering principles. In the context of breaching, the term "fundamentals" refers to the essential technical knowledge and skills required to successfully execute these operations. This includes understanding the types of obstacles one might encounter, the tools and explosives necessary to breach those obstacles, and the methods for assessing the structural integrity of the barriers being breached.

Effective breaching operations rely heavily on engineering principles, such as structural analysis and the mechanics of materials, to ensure safety and effectiveness. These principles guide decision-making in terms of how to approach different obstacles, select and apply appropriate tools, and execute the operation safely and efficiently.

In contrast, simplistic strategies that require minimal planning, advanced technology applications, and general morale of units lack the depth and technical foundation that underpin successful breaching operations. While all of these factors may play a role in the overall success of a mission, they do not encapsulate the core technical knowledge that defines the fundamentals of breaching.