Final answer:
Hard-crusted breads and rolls are considered 'Lean Dough Products' due to their low fat and sugar content, characterized by a chewy texture and crusty exterior, unlike rich dough products which are softer and contain more fat and sugar.
Step-by-step explanation:
The type of bread that falls under "Lean Dough Products" would be b) Hard-crusted breads and rolls. Lean dough is defined by its low fat and sugar content. Products made from lean dough typically have a chewy texture and a crusty exterior. Examples include baguettes, ciabatta, and sourdough.
Unlike hard-crusted breads, sweet rolls, rich dinner rolls, and coffee cakes are considered rich dough products because they contain higher amounts of fats, sugars, and sometimes dairy, which results in a softer and richer texture.