What type of storage system is used for storing multiple cylinders of CNG?

The correct choice focuses on the Cascade Storage System, which is specifically designed for storing multiple cylinders of compressed natural gas (CNG). This method involves connecting multiple high-pressure cylinders in a sequence, allowing them to fill one another in a controlled and efficient manner. The Cascade Storage System optimizes space and ensures a steady supply of gas by facilitating the gradual transfer of gas from higher-pressure cylinders to lower-pressure ones when needed.

The other storage methods listed do not provide the same benefits when it comes to handling multiple cylinders of CNG. Single Cylinder Storage refers to the storage of individual cylinders, which can be less efficient when dealing with larger quantities of gas. Tank Farm Storage typically involves larger, more permanent installations and may not specifically address the handling of cylinders themselves. Vertical Cylinder Storage might refer to a physical arrangement but lacks the functionality and efficiency of a cascade system in managing multiple cylinders for high-demand usage.