Consider the Python function below which calculates the present value of a perpetuity $($dividend$)$ using the Dividend Discount Model $($DDM$).$ What does D $/$ k represent in the context of stock valuation?def calculate$\_$perpetuity$-$value$($D$,$ k$)$:return D $/$ kThe initial dividend to be paid next year.The value of the stock assuming a perpetual growth rate equal to the discount rate k$.$The value of the stock assuming a zero growth rate and constant dividend D$.$The total dividend payout over an infinite time horizon.