Select the correct answer from each drop-down menu. The function below describes the population of caribou in a tundra, where f(t) represents the number of caribou, in hundreds, and t represents the time, in years.

f(t)=1.8(1.2)^t

Initially, the tundra has (180,120,1.8,1.2.1)
caribou, and every (1.2years, 1.8years, 1year, 120years, 180years)
, the number of caribou increases by a factor of (1.8, 1.2, 180, 120, 1)
.