After the contract, the price of each reprint was increased from 0.20 yuan to 0.25 yuan. Some people reflected this situation to the competent department. The competent department notified the red light copy service company to either ensure the original price remains unchanged or terminate the contract Contract. The contractor has taken some measures that have neither reduced profits nor violated the requirements of the competent authority. What are the most likely measures taken by the contractor? ['The contractor maintained the original price of 0.20 yuan, but used copy paper with a lower purchase price.', 'The contractor stated the reason for the price increase to the competent authority, and caused the competent authority to take back the notice.', 'The contractor insists that the price of O.25 yuan remains unchanged, but uses higher-priced copy paper.', 'The contractor insists that the price of O.25 remains unchanged, but adds other businesses with lower fees.']