Utilize the input text as a context reference, choose the right relationship between NETBANX and Optimal Payments from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Optimal Payments operates subsidiary brands, providing the NETBANX gateway solution, NETELLER e-money payments, and a free P2P money transfer service.

Answer: owned_by