Analyze the relationship between 'Tim Armstrong' and 'AOL' within the context of the input sentence.
Options: headquarters location, employer, director/manager, owned by

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