If the model below is to give a "reasonable" valuation of a stock, which of the following is not a valid assumption for the model?

hat$(P{)}_0=\frac{D_0(1g)}{r_s-g}$

Growth, g $,$ is negative.

There will be no growth, i$.$e$.,$ g is zero.

The growth rate exceeds the required rate of return.

The required return is exceptionally high $)>(30\%.$

All of the above are workable assumptions and are valid in the sense that the model can be used even if they hold true.