Plz algebra 1

park rangers released 4 fish into a pond in year 0. each year, there were three times as many fish as the year before. how many fish were there after x years? write a function to represent this scenario. a. f(x) = 4(x)3 b. f(x) = 3(x)4 c. f(x) = 3(4)x d. f(x) = 4(3)x