‘Triangulation that involves comparing and cross checking consistency of data derived by different means at different times using qualitative methods.’ This statement indicates comparison of

(i) observational data with interview data.

(ii) observational data with questionnaire data.

(iii) what participants of a programme say in public with what they say in private.

(iv) opinions of the non - participants of a programme with others who were associated with programme in one capacity or the other.  

Select the correct answer from the options given below :