Which of the following are the characteristics that ensure quality in library statistics:

(A). The quality of library statistics depends on accurate and timely data. 

(B). It helps to determine the growth of the library as well as planning and controlling the activities of the library.

(C). The Larger the sample population, the more accurate will be the results. 

(D) In order to get accurate data, predefined questionnaires need to be prepared and populated among the target population at periodic intervals.