Which of the followings is a solution to the recurrence relation an = -8*an-1 - 16*an-2 with the initial conditions ao = 2 and a = 4? Select one: O a. an = 224-724 b. an = 2*4h-n4" O c. an = 2*(-4)" - 3*n2+(-4) O d. an = 2*(-4) - 3*n*(-4)