With respect to the sampling plan, three decisions must be made: 1) the sampling unitwho is to be surveyed; 2) sample sizehow many people should be surveyed; and 3) ________. A) sample costhow much does sampling cost B) surveyor skillwho should conduct the survey C) sample securityhow should the sample data be protected D) sampling procedurehow should respondents be chosen E) sample supervisorwho leads the sampling effort