How Are Space Probes to the Outer Planets Such as Jupiter

How are space probes to the outer planets such as Jupiter protected from being obliterated by collisions with asteroids in the asteroid belt?

A) They aren't. Only one out of every four spacecraft is lost to collisions with asteroids, so it is less expensive to take this risk.
B) The spacecraft are equipped with cameras to detect asteroids so that they can be directed safely around them.
C) The spacecraft are sent in an inclined orbit that arcs above or below the asteroid belt, and then they cross the ecliptic again near Jupiter.
D) They aren't. Asteroids are so far apart that the spacecraft just sail through.