Fidelity National Information Services Inc. agreed to buy SunGard for $5.1 billion in cash and stock, a decade after a group of private-equity firms acquired the financial software company in one of the signature deals of the buyout boom that preceded the financial crisis.
Take context from the input text and decide on the accurate relationship between 'SunGard' and 'software' from the options provided.
Options: currency, employer, product/material produced, chief executive officer