Which statement about combination systems is true?

The statement that combination systems can support both manual and automatic firefighting methods is accurate because combination systems are designed to utilize both standpipes and sprinklers in a single framework. This flexibility allows for a range of firefighting techniques to be employed effectively depending on the situation.

In practice, firefighters can use the standpipe system for manual firefighting with hoses, allowing them to directly engage fires with the assistance of the water supplied through the system. Simultaneously, the sprinkler component can automatically activate to control or suppress fire before firefighters arrive on the scene. This versatility is crucial in improving fire response time and enhancing overall safety in the building.

The other options present limitations or incorrect assumptions regarding combination systems. For example, while combination systems may require more initial investment compared to separate systems, their use is justified by the comprehensive firefighting coverage and efficiency they provide. The idea that they require no maintenance is misleading; like all fire protection systems, they need regular maintenance to ensure reliability. Lastly, combination systems are not limited to residential buildings; they are frequently utilized in commercial and industrial settings as well to address the diverse needs of these environments.