What is one of the three general types of connections along with pinned and rigid?

The correct choice identifies "Gravity" as one of the three general types of connections in structural engineering. In this context, connections refer to how different structural elements are joined or interact with each other.

Gravity connections, also known as simple connections, primarily transfer vertical loads and are designed to resist tension and compression from the weight of the structure or additional loads acting upon it. They facilitate the movement and rotation of structural elements by allowing some level of relative displacement and do not carry any significant moment forces, unlike rigid connections which are capable of transferring moments and shear forces between connected elements.

Understanding the different types of connections, such as pinned and rigid, along with gravity, is essential for effectively designing structures that are both safe and functional. The classification of connections influences how loads are handled, which in turn affects the overall stability and integrity of a building.