Two Technicians Are Discussing the Proper Coolant to Use on a Late

Two technicians are discussing the proper coolant to use on a late model GM vehicle. Technician A says that "DEX-COOL" type Organic Acid Technology [OAT] is the proper coolant to use. Technician B says that Ethylene Glycol [good old green] type antifreeze can be used on any vehicle. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B