The diagram below shows two production possibility frontiers (PPF1 PPF_1\,PPF1 and PPF2PPF_2PPF2) for an economy.

If the economy moves from point M M\,M to point KKK, this is most likely to represent:
an increase in the economy's productive potential.
a reduction in the level of unemployment and idle resources.
a more equitable distribution of resources.
an outward shift in the long-run aggregate supply (LRAS) curve.