Which of the following statements is correct concerning statistical sampling in tests of controls?

a. The population size has little or no effect on determining sample size except for very small populations.

b. The expected population deviation rate has little or no effect on determining sample size except for very small populations.

c. As the population size doubles, the sample size also should double.

d. For a given tolerable rate, a larger sample size should be selected as the expected population deviation rate decreases.