Which of the following is a zone observed in hard palate
The following zones can be observed in hard palate 

Gingival region, adjacent to the teeth.
Palatine raphae, also known as median area, extending from the incisive papillae or palatine papillae posteriorly.
Anterolateral area or fatty zone between the raphae and gingiva.
Pcsterolateral area or glandular zone between the raphae and gingiva.
Fatty zone
Glandular zone
Gingival region
All of the following