Question:Which of the following statements is/are true? i)A 'longitudinal' survey is one where the same set of respondents complete the same survey on two or more occasions. ii)A 'cross-sectional' survey is one where the same set of respondents complete different surveys on two or more occasions. 

A Both (i) and (ii) are true. 

B Only (i) is true. 

C Only (ii) is true. 

D either is true. 

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