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

Which one of the following movements represents an economy that has achieved short-run economic growth by utilizing unemployed resources, but has not experienced any change in its productive potential (long-run growth)?
Movement from XXX to YYY
Movement from WWW to XXX
Movement from WWW to YYY
Movement from YYY to ZZZ