Considering the types of materials, analyze the following statements: A) Most materials are composed of only two phases: a phase called matrix, wh...

Considering the types of materials, analyze the following statements:
A) Most materials are composed of only two phases: a phase called matrix, which involves the other phase called dispersed phase (which can be fibers or particles). According to the geometry of the dispersed phase (shape, size, distribution, and orientation), composites can be classified into: particle-reinforced composites, fiber-reinforced composites, structural composites, and nanocomposites.
I. In particle-reinforced composites, the dispersed phase has equiaxial geometry, that is, similar dimensions in all directions.
II. In fiber-reinforced composites, the dispersed phase can have the geometry of long fibers or discontinuous fibers (short fibers).
III. In structural composites, the dispersed phase has the geometry of long fibers.
IV. In nanocomposites, the dispersed phase has extremely small dimensions in the order of tens of nanometers.
Which statements are correct?

I. In particle-reinforced composites, the dispersed phase has equiaxial geometry, that is, similar dimensions in all directions.
II. In fiber-reinforced composites, the dispersed phase can have the geometry of long fibers or discontinuous fibers (short fibers).
III. In structural composites, the dispersed phase has the geometry of long fibers.
IV. In nanocomposites, the dispersed phase has extremely small dimensions in the order of tens of nanometers.
a) I, II, III, and IV are correct.
b) I and II, only.
c) II and III, only.
d) III and IV, only.
e) II, only.