What is the relationship between extra and Nine in the context of the input sentence. Choose an answer from: 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.

News Corp, Telstra and Seven West Media agreed on Tuesday to pay $2.51 billion for six years from 2017 for AFL rights, a little over a week after the NRL granted an extra free-to-air game to Nine Entertainment Co in a deal worth $925 million over five years starting in 2018.

Answer: original_broadcaster