What is the oxidation number of S\text{S}S in barium thiosulfate monohydrate, BaS2O3⋅H2O\text{BaS}_2\text{O}_3 \cdot \text{H}_2\text{O}BaS2O3⋅H2O?
+2+2+2
+3+3+3
+4+4+4
+6+6+6