What Is the Difference Between Formal Political Democracy and Effective

what is the difference between formal political democracy and effective political democracy?

A) in an effective political democracy, all citizens are able to vote and express their opinions.
B) in an effective political democracy, all citizens are able to participate on fairly equal terms.
C) in an effective political democracy, the country has all the mechanisms and forms of democracy in place.
D) in an effective political democracy, certain groups with wealth or military control have disproportionate power.