Attack lines can be multiple jacket or what type?

Attack lines can indeed be multiple jacket or rubber covered. Rubber-covered attack lines are designed for durability and flexibility, providing a robust exterior that can withstand harsh conditions often encountered in firefighting. This type of line is typically resistant to abrasions, chemicals, and environmental factors, making it suitable for a variety of firefighting scenarios.

Rubber's waterproof properties also help in preventing absorption of water into the hose, maintaining a consistent weight and handling during operations. The added layer of protection further contributes to the longevity of the hose, resulting in a reliable tool for firefighters when combating fires.

The other options, while they may have their uses, do not offer the combined benefits of durability and resilience to the same extent that rubber coverings do in the context of attack lines.