If f(x) is the total number of bacteria present in a sample after x hours , which of the following statements best describes the meaning of f(2)=12 A. The total number of bacteria present in a sample after 12 hours is 2. B. The total number of bacteria present in the sample after 6 hours is 12. C. The total number of bacteria present in the sample after 2 hours is 12. D. The total number of bacteria present in the sample after 6 hours is 12.