What are the minimum requirements for growing cells in culture?
a) Complete culture medium, pH around 7.4 and a 5% CO₂ atmosphere
b) Complete culture medium, pH around 7.4 and a 15% CO₂ atmosphere
c) Complete culture medium, pH around 9.4 and a 5% CO₂ atmosphere
d) Basal medium, pH around 7.4 and a 5% CO₂ atmosphere
