Answer:
The answer is "of others".
Step-by-step explanation:
The auction site has become a service, in which auction clients or members are using the internet to buy or sell goods and services.
- These sites use the different auction sites, which include forums for consumers, operated by multiple software, that's sale forms also recognized as a virtual auction.
- These sites sell items owned by the others, which is an auctioneer does at a public auction.