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.
Analyze the relationship between 'Jeff Bezos' and 'Amazon' within the context of the input sentence.
Options: brand, employer, headquarters location, member of