What is the difference between nominal and real prices?

I- Nominal prices are absolute prices, while real prices take into account the aggregate price level.
II- Real prices are absolute prices, while nominal prices take into account the aggregate price level.
III- Nominal prices are adjusted for inflation, while real prices are not.
IV- Real prices are adjusted for inflation, while nominal prices are not.
V- Nominal prices are used to compare prices over time, while real prices are used to compare prices at a given point in time.