What is the relationship between Comcast and Brian Roberts 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.

Comcast Chief Executive Brian Roberts told reporters there were no plans for an IPO in the near term, but added a new board would revisit the idea.

Answer: chief_executive_officer