The table shows the estimated number of deer living in a forest over a five-year period. which type of function best models the data? write an equation to model the data.

year estimated population
0 100
1 79
2 62
3 49
4 39

a. linear; y = 0.79x + 100
b. quadratic; y = 100x2 + 0.79
c. exponential; y = 100 * 0.79x
d. quadratic; y = 0.79x2 + 100