The number of bacteria in a sample increased by a factor of 2 every minute from 9: 05 am to 9: 55 a. m.. the function below shows the number of bacteria in the sample f(x) after x minutes from 9: 05 a. m.: f(x) = 10(2)x which of the following is a reasonable domain for the function?

a. 0 ≤ x ≤ 10

b. 5 ≤ x ≤ 55

c. 0 ≤ x ≤ 50

d. all positive integers