In the context of the input sentence, determine the relationship between 'Telstra' and 'David Thodey'.
Options: distributed by, chief executive officer, brand, operator

David Thodey engineered a stunning turnaround at Telstra , extending its dominant position in the mobile sector, negotiating lucrative agreements with the government (twice) over the National Broadband Network, selling off non-core assets and cutting expenses.
chief executive officer