Final answer:
The representative who can represent a taxpayer before the IRS Appeals Office under Circular 230 can be either a CPA or an attorney.
Step-by-step explanation:
The representative who can represent a taxpayer before the IRS Appeals Office under Circular 230 can be either a CPA (Certified Public Accountant) or an attorney. Both a CPA and an attorney are authorized to represent taxpayers in appeals before the IRS Appeals Office.
CPAs are experts in tax matters and can provide guidance and representation for tax-related issues. Attorneys, on the other hand, are trained in law and can provide legal advice and representation in tax appeals.
To summarize, option e. 'Only a and c' is the correct answer.