Which expression correctly represents a balanced reduction half-reaction?

For answering for the question, there exists four choices:
1) Na+  +  e- Na
2) Na Na+   +  e-
3) Cl2 +   2e-   Cl-
4) 2Cl-  Cl2 +  2e-

reduction half-reaction general formula is 
oxidant + e - or +   Product

so in our case the answer is 
1) Na+  +  e-  Na (exactly balanced)

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