The constant growth model can be used to value the stock of firms that have which type(s) of dividends?
1) Dividends that change annually by a constant amount
2) Dividends that change annually by a constant amount or that are zero
3) Dividends that are either constant or change annually at a constant rate
4) Dividends that change by either a constant amount or a constant rate
5) Only dividends that increase at a constant rate
