I want to know the answer to the following question:
On what principle did the Novi Sad Agreement focus upon?
All the background I'm provided with is that "The evidence supporting this claim is patchy: Croatian linguist Stjepan Babić complained that the television transmission from Belgrade always used the Latin alphabet— which was true, but was not proof of unequal rights, but of frequency of use and prestige.". Is that enough to answer the question?