Which of the Following Represents All of the Ways a CPA

Which of the following represents all of the ways a CPA firm can be organized?

A) proprietorships and partnerships
B) proprietorships, partnerships, and professional corporations
C) proprietorships, general partnerships, general corporations, professional corporations, limited liability companies, and limited liability partnerships if permitted by state law
D) single proprietorships, partnerships, professional corporations if permitted by state law, or regular corporations