Two contractors are comparing organizations that rate product sustainability. Contractor A says that the Energy Star system rates and labels energy-efficient light bulbs, fixtures, and appliances, and the Green Seal is applied to water-conserving toilets, faucets, and showerheads. Contractor B says that a comprehensive Energy Star label is available for homes and commercial buildings, after the building undergoes a special energy analysis and receives a HERS index. Which one of the following statements is correct?a. Only Contractor A is correct.b. Only Contractor B is correct.c. Both Contractor A and Contractor B are correct.d. Neither Contractor A nor Contractor B is correct.