In the context of the input sentence, determine the relationship between 'Lockheed Martin' and 'United Launch Alliance'.
Options: subsidiary, product/material produced, owner of, location of formation

Aerojet Vice President Julie Van Kleeck declined comment on reports that Aerojet has offered $2 billion to acquire United Launch Alliance (ULA), a 50-50 rocket launch venture of Lockheed Martin Corp and Boeing Co.
owner of