Diana Roth is a California CPA practicing in California. She is a sole proprietor with three professional employees and two paraprofessional employees. Diana has owned her own firm for five years. Which of the following names may Diana use for her practice without registration and approval from the Board of Accountancy?

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a) Accurate City Bookkeeping

b) Diana Roth, CPA

c) Alpha Tax Preparation and Bookkeeping

d) All of the above

e) Both a. and b.