Final answer:
The National Consumer Credit Protection Act 2009 regulates all consumer credit products, including personal loans and payday loans, provided they are for personal, domestic, or household purposes.
Step-by-step explanation:
The loan type regulated under the National Consumer Credit Protection Act 2009 includes personal loans, payday loans, and other consumer credit products. However, business loans do not typically fall under this act unless they are for personal, domestic, or household purposes. Thus, the correct answer is d) All of the above, as long as the loans are taken out by individuals or related to personal, domestic, or household purposes.