What differentiates a dividend reinvestment plan from a stock dividend?

a) A dividend reinvestment plan allows investors to use dividends to buy new shares, while a stock dividend is a dividend paid in additional shares.

b) Stock dividends are voluntary whereas a dividend reinvestment plan is mandatory.

c) A dividend reinvestment plan allows shareholders to buy additional shares at a discount, whereas with a stock dividend shareholders receive no discount.

d) Stock dividends allow shareholders to purchase additional shares with their dividends at a special discount, whereas a dividend reinvestment plan allows shareholders to purchase shares at the market price.