What distinguishes Registered Manufacturers in the CNG sector?

The distinction of Registered Manufacturers in the CNG sector lies in their official registration to perform activities related to compressed natural gas manufacturing. This means they have met specific regulatory requirements and standards set by the relevant authorities, which may include safety, operational, and environmental guidelines. Being registered allows these manufacturers to legally produce and supply CNG and related equipment, ensuring that they comply with industry standards and practices.

The other options do not accurately capture what Registered Manufacturers entail. Non-profit status is irrelevant to their registration; not registering with regulatory bodies would disqualify them from being recognized as legitimate manufacturers; and limiting their activities to equipment for stationary tanks does not encompass the broader scope of their capabilities in CNG production and operations. Therefore, the correct answer reflects the comprehensive role that Registered Manufacturers play in the CNG industry.