{ 1 } - consequentialist (duties are based on consequences).
{ 2 } - deontological (duties are based on rules).
{ 3 } - both.

Mill holds that we ought to do whatever has the best consequences. Rules are rough guides to consequences; lying is (usually) wrong because lying (usually) has bad consequences.

Deontologist disagree. They say, for example, that lying can be wrong even in cases where it has the best consequences.