What Are the Spectator Ions and What Is the Net

What are the spectator ions and what is the net ionic equation for the following double-replacement, precipitation reaction?
Na₂S (aq) + ZnSO₄ (aq) →Spectator Ions Net reaction
I. Zn²⁺ and S^{2 -} 2 Na⁺ (aq) + SO₄^{2 -} (aq) →Na₂SO₄ (aq)
II. Na⁺ and SO₄^{2 -} Zn²⁺ (aq) + S^{2 -} (aq) →ZnS (s)
III. Na⁺ and Zn²⁺ S^{2 -} (aq) + SO₄^{2 -} (aq) → S₂O₄^{4 -} (aq)
IV. S^{2 -} and SO₄^{2 -} Na⁺ (aq) + Zn²⁺ (aq) →NaZn³⁺ (aq)
V. Na⁺ and S^{2 -} Zn²⁺ (aq) + SO₄^{2 -} (aq) →ZnSO₄ (s)

A) I
B) II
C) III
D) IV
E) V