A bacterial colony initially has 4000 cells and triples every week. Write a function that can be used to model the population, P, after t days.
a) P(t) = 4000 * 3ᵗ
b) P(t) = 4000 * 3⁷ᵗ
c) P(t) = 4000 * 3ᵗ/⁷
d) P(t) = 4000 * 3ᵗ/⁷ * 7