Twenty five sets of problems on data interpretation each for the DI section of 25 CATALYST test were prepared by the AMS research team. The DI section of each CATALYST contained 50 questions of which exactly 35 questions were unique, i.e. they had not been used in the DI section of any of the other 24 CTALYSTs. What could be the maximum possible number of questions prepared of the DI sections of all the 25 CATALYSTs put together???
a)1055
b)975
c)1070
d)1100