Final answer:
The correct answer is d. All of the above.
Step-by-step explanation:
A borrower is considered to have defaulted on a loan if he fails to:
- return the loaned security after appropriate notice from the lender.
- pay dividends or interest on the loaned securities to the lender.
- meet a demand for additional collateral.
Therefore, the borrower is considered to have defaulted on a loan if any of the above conditions are not met, which means the correct answer is d. All of the above.