What are the three key wine regions of Puglia?

Puglia, located in the heel of Italy's boot, is known for its diverse wine production. The three key wine regions highlighted in the correct answer are representative of Puglia's significant wine styles and quality designations.

Salice Salentino DOC, known for robust red wines primarily made from the Negroamaro grape, produces some of the region's most recognized wines. Copertino DOC is also situated in the province of Lecce, further showcasing the local terroir and grape varietals. Puglia IGT, or Indicazione Geografica Tipica, encompasses a broader range of wines from the region, reflecting the overall characteristics of Puglia's wine offerings.

These designations not only signify quality but also help define Puglia's unique contributions to the Italian wine landscape, established through various local grape varieties and winemaking traditions. In contrast, the other options refer to regions and designations that are associated with different parts of Italy, which do not pertain to Puglia itself.