The mother of a new-born asks the nurse how often she should breastfeed her baby. Which of the following responses by the nurse would be best

A．"Newborns should breastfed at least every 3 hours during the day. "

B．"Newborns should be fed when they cry. "

C．"As long as the baby feeds four times a day, he will get enough. "

D．"Newborns may breastfeed continuously until they stabilize. "

工伤认定结束后，社会保险行政部门应当将工伤认定的有关资料保存（）年。

A.15

B.25

C.50

D.70