Technician a Says That the Oil Used in the Earliest

Technician A says that the oil used in the earliest EGR engines has a different API designation than oil used in engines with particulate filters. Technician B says that the oil used in engines equipped with particulate filters can be used in EGR engines. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B