The net that represents a triangular pyramid (also known as a tetrahedron) is the one that consists of 4 triangles.
Based on the descriptions you provided, the second option sounds like the most accurate representation, as it mentions an unfolded version of a pyramid with 4 triangles. This aligns with the structure of a triangular pyramid, which has a triangular base and three triangular faces meeting at a common vertex.
So, the correct answer would be: The second option.