The Regulations on the Management of Energy Efficiency Labeling stipulates that the energy efficiency level 5 is the minimum energy efficiency standard and the minimum requirement for product launch. Below this requirement, production and sales are not allowed. Energy saving labels and energy efficiency labels are two different concepts. The certification standard for energy-saving refrigerators is energy efficiency level two, and all energy-saving products must meet the level two or higher energy efficiency standards. However, this does not mean that all products marked with a level two or level one energy efficiency label are energy-saving products. Certification can determine whether it is an energy-saving product. Based on the above information, which of the following is conclusions correct? ['Energy-saving products must be marked with a secondary or primary energy efficiency label.', 'All products marked with energy efficiency are energy-saving products.', 'It can be considered as an energy-saving product when it reaches the secondary energy efficiency standard.', 'Energy efficiency products are qualified products and energy-saving products.']