Final answer:
The Financial Accounting Standards Board (FASB) is the body authorized to promulgate accounting principles enforceable under Rule 203 of the AICPA Code of Professional Conduct.
Step-by-step explanation:
The bodies designated by Council authorized to promulgate accounting principles enforceable under Rule 203 of the AICPA Code of Professional Conduct include the Financial Accounting Standards Board (FASB).
The Public Company Accounting Oversight Board (PCAOB) is authorized to establish auditing and related professional practice standards for registered public accounting firms to follow in the preparation and issuance of audit reports. The Securities and Exchange Commission (SEC) also has the authority to set accounting standards, particularly for publicly traded companies. However, the AICPA has recognized the FASB as the designated private sector body to establish accounting standards.
To specifically answer the student's question, the FASB is the body that is authorized to promulgate accounting principles that are enforceable under Rule 203.