The litter may be designed in what kind of configurations?

The correct choice identifies that litter configurations can be designed as one-piece or two-piece. This distinction is crucial in emergency medical situations where optimizing ease of use, stability, and patient security are paramount.

A one-piece litter is typically a single, solid structure that offers simplicity and strength, making it ideal for transporting patients quickly over varied terrain. In contrast, a two-piece litter consists of two separate components that can be connected or used independently, providing flexibility for different scenarios, such as confined spaces or when a team might need to deploy it from a distance.

This ability to choose between one-piece and two-piece configurations allows emergency responders to adapt to the specific needs of the rescue operation, thus enhancing patient care and safety during transport. Other configurations, like collapsible or rigid, while also relevant in certain contexts, do not encapsulate the same range of use cases directly related to patient transport.