How is a donut hose roll characterized compared to a straight hose roll?

The correct option describes how both couplings being on the outside distinguishes a donut hose roll from a straight hose roll. In a donut roll, the hose is coiled tightly in a circular shape, which keeps the couplings exposed on the outside, making it easy to access them quickly when the hose is deployed. This characteristic is particularly beneficial in firefighting operations as it facilitates rapid deployment without needing to unroll the hose extensively.

In contrast, a straight hose roll typically has the couplings arranged in a way that can lead to them being positioned either at one end or nestled into the roll, which can complicate access. Understanding the structure of the donut roll and the convenience it offers in terms of quick access to the couplings is essential for effective hose management during emergencies.