An accountancy corporation is a corporation which is registered with the California Board of Accountancy and has a currently effective certificate of registration from the board pursuant to the Moscone-Knox Professional Corporation Act, as contained in Part 4 (commencing with Section 13400) of Division 3 of Title 1 of the Corporations Code, and this article. Subject to all applicable statutes, rules and regulations, an accountancy corporation is entitled to practice accountancy. With respect to an accountancy corporation, the governmental agency referred to in the Moscone-Knox Professional Corporation Act is the California Board of Accountancy.