Which statement is correct?
a. both comet types come from random directions in a spherical distribution around the sun, but the long-period comets come from farther away.
b. short-period comets come from some location near the ecliptic plane of the solar system, and long-period comets come from farther away, with random directions in a spherical distribution around the sun.
c. both comet types come from some location near the ecliptic plane of the solar system, but the long-period comets come from farther away.
d. short-period comets come from a random direction in a spherical distribution around the sun, and long-period comets come from farther away, in some location near the ecliptic plane of the solar system.