Determine whether the sampling method described below appears to be sound or is flawed. In a survey of 639 human resource professionals, each was asked about the importance of the experience of a job applicant. The survey subjects were randomly selected by pollsters from a reputable market research firm. . . . Choose the correct answer below. O A. It is flawed because it is a census. O B. It appears to be sound because the data are not biased in any way. O C. It is flawed because it is a voluntary response sample. O D. It is flawed because it is not statistically significant