Which of the following is correct?
(a) $\mathrm{S}_{3} \mathrm{O}_{9}-$ contains no $\mathrm{S}-\mathrm{S}$ linkage
(b) $\mathrm{S}_{2} \mathrm{O}_{6}^{2-}-$ contains $-\mathrm{O}-\mathrm{O}$ - linkage
(c) $\left(\mathrm{HPO}_{3}\right)_{3}-$ contains $\mathrm{P}-\mathrm{P}$ linkage
(d) $\mathrm{S}_{2} \mathrm{O}_{8}^{2-}$ contains $\mathrm{S}-\mathrm{S}$ linkage