Which is not a source of secondary data?

By Anthony
0 Min Read

Which of the following are NOT sources of secondary data?
a) Interview
b) Questionnaire
c) Observation
d) Unpublished thesis
e) Annual report
Choose the correct option from the following:

a, d and e
b, c and d
c, d and e
a, b and c

Option 4 : a, b and c