A cell culture in a petri dish has an initial population of 100, and it doubles in size every 4 hours. Can this situation be modeled with a linear or exponential function?

The cell culture population increases by a constant difference for equal time intervals. This is a linear function.

The cell culture population increases by a constant factor for equal time intervals. This is a linear function.

The cell culture population increases by a constant difference for equal time intervals. This is an exponential function.

The cell culture population increases by a constant factor for equal time intervals. This is an exponential function.

The cell culture population increases by a constant factor for equal time intervals. This is an exponential function.