When ozone reacts with an excess of potassium iodide solution buffered with a borate buffer (pH 9.2), iodine is liberated and can be titrated against a standard solution of sodium thiosulphate as a quantitative method for estimating O3 gas. When liberated I2 reacts with sodium thiosulphate, what product(s) are formed?
a. S4O62−
b. SO42−
c. S2O42−
d. S