Our top 10 customers for the second quarter of 2015 as a percentage of revenue were AT&T with 17%, DIRECTV was 12%, Momentum Midstream was 9%, Berkshire Hathaway Energy, Plains All-American Pipeline, Duke Energy and Wisconsin Energy were 3% each, and Energy Transfer, Sprint and CNRL were each at 2% of total revenue.
Utilize the input text as a context reference, choose the right relationship between 'DIRECTV' and 'at' from the options.
Options: developer, chairperson, founded by, owned by