What is the relationship between KPN and Base 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.

-- Cable telecoms company Liberty Global's Belgian subsidiary Telenet to buy mobile network operator Base from Dutch group KPN (notified Aug. 17/deadline Sept. 21)

Answer: owner_of