Samuel wants to conduct a customer satisfaction survey for his restaurant. He knows that he must randomly select a sample of his customers in order to administer the survey, but he is uncertain about the sample size that is needed. Which of the following must be true about Samuel's sample in order to produce a well-designed and well-conducted survey?

A.
Samuel's sample should be chosen at random and be large enough to represent the entire customer population.
B.
Samuel's sample should be chosen at random and be exactly one-half of his customer population.
C.
Samuel's sample must be the entire population of customers.
D.
Samuel's sample should only be his regular customers.