题目内容：
The following statements relate to different types of data:
(i) Secondary data are data collected especially for a specific purpose
(ii) Discrete data can take on any value
(iii) Qualitative data are data that cannot be measured
(iv) Population data are data arising as a result of investigating a group of people or objects
Which of the statements are true?
A(i) and (ii) only
B(ii) and (iii) only
C(ii) and (iv) only
D(iii) and (iv) only
答案解析：