When Preparing a Sampling Plan, the Researcher Needs to Decide

When preparing a sampling plan, the researcher needs to decide how to contact prospective subjects for the survey.The most common choices are:

A) mail, telephone, and Internet.
B) mail, telephone, and optical scan.
C) mail, telephone, and personal interview.
D) observation, personal interview, and experimentation on a person-by- person basis.
E) observation, telephone, and personal interview.