Which of the following amounts is included in the calculation of a security's cost basis?

Current market value represents the price at which a security can be bought or sold in the market at a given time. It does not affect the cost basis, which is determined solely by the original purchase price and any adjustments such as reinvested dividends or additional purchases made over time.

Cash dividends that are received and withdrawn from an account do not increase the cost basis of the security; they are considered income rather than an investment in the security. The cost basis reflects only the amount invested in the security itself.

Similar to cash dividends, cash interest received and withdrawn is treated as income and does not alter the cost basis of a security. The cost basis is strictly based on the purchase price and reinvestments rather than withdrawals of income from the investment.