A solid sodium halide, NaX, is reacted with concentrated sulfuric acid. The lowest oxidation state of sulfur in the products is +4.
Halogen Y$_2$ is less volatile than halogen X$_2$.
What are the identities of sodium halide NaX and halogen Y$_2$?

1 )
A
B
3 )
C
4 )
D
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