Final answer:
The correct answer to the question regarding solar system objects and regions in interstellar space is (b) Interstellar Medium and Voyager 1, as both are located in the space between stars, outside the boundary of our solar system.
Step-by-step explanation:
The question is asking which solar system objects and regions are found in interstellar space. Interstellar space refers to the space between stars. The Oort Cloud is indeed a spherical region surrounding our solar system, residing in the outermost reaches, and it is postulated to be a vast repository of comet nuclei that reside at the edge of the Sun's gravitational influence. The Kuiper Belt, on the other hand, is a disk-shaped region beyond Neptune, home to many small icy bodies and dwarf planets and is part of our solar system but not in interstellar space. The Interstellar Medium (ISM) is the matter that exists in the space between stars within a galaxy and is definitely part of interstellar space. The Voyager 1 spacecraft has crossed the heliopause and is now traveling through interstellar space. Therefore, the correct answer to the question is (b) Interstellar Medium and Voyager 1, because these are the entities that reside in interstellar space outside our solar system's boundary.