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Which of the following represents a metamorphic rock? (1) slate (2) shale (3) quartzite . The correct answer is___________?

Which of the following represents a metamorphic rock? (1) slate (2) shale (3) quartzite . The correct answer is___________?

A. only (3)
B. both (1) and (3)
C. both (2) and (3)
D. all (1), (2) and (3)