Article 40 (a) and (b) of the Operational Guidelines for the Suitability System of Financial Futures Investors, other income certificates provided by investors shall be income certificates with official seals issued by the personnel department or labor department of the current employer. Article 37, subparagraphs c and d. The annual income certificate provided by the investor shall be the income tax payment certificate issued by the tax authorities, the payroll issued by the bank or other income certificates. So the answer to this question is ACD.