A talent competition on television had five elimination rounds. After each elimination, only one-third of the contestants were sent to the next round. The table below shows the number of contestants in each round of the competition: x 1 2 3 4 5 f(x) 243 81 27 9 3 Compute the average rate of change of f(x) from x = 1 to x = 4, and describe what it represents. −78 contestants per round, and it represents the number of contestants who will reach the final round −234 contestants per round, and it represents the number of contestants who will reach the final round −234 contestants per round, and it represents the average rate at which the number of contestants changed from the first round to the fourth round −78 contestants per round, and it represents the average rate at which the number of contestants changed from the first round to the fourth round