The correct options are
A All tiers of the government must abide by the rules of power-sharing.
C All tiers of the government should agree to function together.
D All tiers of government should have mutual trust and agree on the ideals of the Constitution.
All federal governments and their units must agree on three key principles. Firstly, all tiers of the government should agree to function together. Secondly, all tiers of government should have mutual trust and agree on the ideals of the constitution. Lastly, they should also trust that they will all abide by the rules of power-sharing. All tiers have specific areas in which they have their own jurisdiction. They all have financial autonomy, and are ensured a source of revenue, but they need not share income.