The oxoacid of sulphur that does not contain bond between sulphur atoms is :

$\mathrm{H}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}$

$\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$

$\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$

$\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}$