Which of the following statements about primary data and secondary data is/are true？
A．Primary？data？are？collected？by？the？researcher;？secondary？data？are？derived？from？primary？dAB．Secondary？data？are？collected？through？interviews,？surveys;？primary？data？are？derived？from？books,？newspapers,？Internet,...C．Primary？data？has？fewer？resource？requirements;？secondary？data？has？more？resource？requirements.D．Primary？data？are？fresher？and？more？updated;？secondary？data？tends？to？be？of？higher？quality.E．Secondary？data？are？less？suitable？to？match？our？need;？primary？data？are？better？matching？our？neeD．
