Consider the following statements about absorption$-$ and variable$-$costing income:

I. Yearly income reported under absorption costing will differ from income reported under variable costing if production and sales volumes differ.

II$.$ In the long$-$run, total income reported under absorption costing will often be close to that reported under variable costing.

III. Differences in income under absorption and variable costing can often be reconciled by multiplying the change in inventory $($in units$)$ by the variable manufacturing overhead cost per unit.

Which of the above statements is $($are$)$ true?

I only.

III only.

II only.

II and III.

I and II$.$