The symbol $$\Delta$$ denotes one of the four arithmetic operations: addition, subtraction, multiplication, or division. If 6 $$\Delta 3 \le 3$$, which of the following must be true?
I. 2 $$\Delta$$ 2=0
II. 2 $$\Delta$$ 2=1
III. 4 $$\Delta$$ 2=4