Technician a Says a 70-30 Mixture of Water and Ethylene

Multiple Choice

Technician A says a 70-30 mixture of water and ethylene glycol is the best coolant formula for most engines.Technician B says a 50-50 mixture of water and ethylene glycol is the best coolant formula for most engines.Who is correct?

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