Please show all work for calculations. Thanks you

What is the value of a firm with initial dividend Div_1, growing for n years (i.e., until year n + 1) at rate and after that at rate g_2 forever, when the equity cost of capital is r? The correct formula is: A. P_0 = Div_1/r - g_1 x [1 - (1 + g_1/1 + r)^n+1 + [1 + g_1/1 + r]^n + 1 x Div_1/r-g_2 B. P_0 = Div_1/r - g_1 x [1 - (1 + g_1/1 + r)^n) + Div_1 x (1 + g_1)^n-1 x (1 + g_2)/(r - g_2) x (1 + r)^n C. P_0 = Div_1/r - g_1 x [1 - (1 + g_1/1 + r)^n) + (1 + g_1/1 + r)^n x Div_1/r - g_1 D. P_0 = Div_1/r - g_1 x [1 - (1 + g_1/1 + r)^n) + (1 + g_1/1 + r)n+1 x Div_1/r - g_2