Take context from the input text and decide on the accurate relationship between 'resume' and 'private' from the options provided.
Options: stock exchange, industry, currency, owned by

Riyadh's July decision to resume issuing sovereign bonds for the first time since 2007 could extend that time frame, perhaps reducing reserve depletion by some $50 billion a year, depending on which private sector funds were used to buy the bonds.
owned by