San Francisco-based Fundbox, which launched in 2012 to offer working capital to business with unpaid invoices, just announced that it added Amazon CEO Jeff Bezos and early Twitter-investor Spark Capital to an investor lineup that includes Khosla Ventures and Blumberg Capital.
Refer to the input text as context and select the correct relationship between 'Jeff Bezos' and 'Amazon' from the available options.
Options: stock exchange, distributed by, owner of, original broadcaster