Treated as rubbish now, he lay at last
upon a mass of dung before the gates—
manure of mules and cows, piled there until
fieldhands could spread it on the king's estate.
Abandoned there, and half destroyed with flies,
old Argus lay.

What functions as a symbol in this excerpt?

a mule
the king
Odysseus
Argus


will report if your just trying to get points