Government credit: The government obtains income as a debtor or arranges expenditures as a creditor in accordance with the commercial credit principle of borrowing and repaying, also known as fiscal credit. Which of the following are government credits? ["a county's finance collects 20 million yuan in taxes throughout the year, part of which is expected to be used for public facilities construction.", 'In order to build an environmentally friendly city, its municipal government ordered heavy polluting enterprises to withdraw from the city and imposed huge fines.', 'the Ministry of Finance recently decided to issue a further 16 billion yuan of 20-year Treasury bonds.', 'a state-owned enterprise paid off part of its arrears and cancelled the enterprise through the bankruptcy repayment process.']