Final answer:
All three types of fibers (collagen, elastic, and reticular) are found in areolar connective tissue, which helps in holding organs and provides strength, flexibility, and support.
Step-by-step explanation:
All three types of fibers (collagen, elastic, and reticular) are found in areolar connective tissue, which is a type of loose connective tissue proper. This tissue serves to hold organs and other tissues in place and includes a matrix that is the most abundant feature of this loose tissue. Collagen fibers in areolar connective tissue provide strength and resist stretching, elastic fibers provide flexibility and the ability to return to original shape after stretching, and reticular fibers form a network for supporting the tissue and other organs to which it is connected.