Each function below represents the four choices she has for her annual salary in thousands of dollars, where t represents the number of years after she is hired.

a(t)=2^t + 25

b(t)=10t+75

c(t)=√400+80

d(t)=2(t+ 1)^2- 10t+50

Which pay plan should Nancy choose in order to have the highest salary in her eighth year?

1) a(t)

2) b(t)

3) c (t)

4) d(t)