Which of these is the best example of a sampling frame?

TutorialWhich of these is the best example of a sampling frame?
Which of these is the best example of a sampling frame?
a. students who sit in the front half of the classroomb. every student in class who passed the examc. the people living in every third condo in a developmentd. all faculty who have a PhD degree and have taught for more than 10 years
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