Which of the following BEST describes the location of the heliosphere:

W) the region that extends a few thousand kilometers outside of the Sun's corona

X) the region that extends from the Sun's corona to the end of the solar system

Y) the region that extends from the Sun's core to the end of the solar system

Z) the region of the expanding solar wind between the sun and the heliopause
Z) THE REGION OF THE EXPANDING SOLAR WIND BETWEEN THE SUN AND THE HELIOPAUSE