What is the compression-to-breath ratio for adult/child/infant one rescuer CPR?
a) 15:2 for adults, 30:2 for children, 30:2 for infants
b) 30:2 for adults, 15:2 for children, 30:2 for infants
c) 30:2 for adults, 30:2 for children, 15:2 for infants
d) 15:2 for adults, 15:2 for children, 15:2 for infants