Take context from the input text and decide on the accurate relationship between 'Tim Armstrong' and 'AOL' from the options provided.
Options: director/manager, headquarters location, owned by, employer

At that time, AOL Chief Executive Tim Armstrong boasted about already being a top three company in Web video, which would surely improve by landing Dermot McCormack, whom Mr. Armstrong called a “game changing talent.” Well, the game quickly changed over at AOL, which was of course acquired by Verizon Communications a few months ago.
employer