题目内容：
Which of the following is/are primary sources of data?
(i) Historical records of transport costs to be used to prepare forecasts for budgetary planning
(ii) The Annual Abstract of Statistics, published by the Office for National Statistics in the United Kingdom
(iii) Data collected by a bank in a telephone survey to monitor the effectiveness of the bank's customer services
A(i) and (ii)
B(i) and (iii)
C(i) only
D(iii) only
答案解析：