From a long-run production function (e.g., Q = 4K + 2L or Q = K0.5L0.5), which of the following may be determined? i. the quantity of output resulting from all combinations of inputs (e.g., capital and labor) ii. the combination of inputs (e.g., capital and labor) that maximizes output iii. the different combinations of inputs (e.g., capital and labor) that yield the same quantity of output iv. the cost to produce a given quantity of output i ii iii iv i and ii i and iii i, ii, and iii i, ii, iii, and iv