During a casual dinner party, Zeus is attacked in hisownhome by Hades.Hades, unbeknownst to Zeus, had brought a small pitchfork to the party and intended on settling an old debt with Zeus.Hades lunged at Zeus with the pitchfork, barely missing Zeus.Zeus could have easily escaped through the back door, but instead reached into a drawer, grabbed his thunderbolt and struck Hades when Hades attacked again.Hades dies.Zeus is charged with the murder of Hades. Which of the following is true?

a) Zeus has no defense available to him

b) Zeus had a duty to retreat because it was reasonably safe to do so

c) Zeus had no duty to retreat because a man's home is his castle

d) Zeus was justified only because he was defending his property