Which type of population growth is shown in this graph?

Population of Bacteria
A graph entitled Population of Bacteria has generation on the horizontal axis, from 0 to 10, and population size on the vertical axis, from 0 to 35,000 in increments of 5,000. From generations 1 to 7, the population size was close to 0. From generations 7 to 10, the population size increased rapidly.
exponential
linear
logistic
limited