What is the relationship between 'Gazprom' and 'Gazprom Export' in the context of the input sentence.
Options: brand, distribution format, subsidiary, founded by

At our conference call today, we have with us the Chief Accountant Mr. Mikhail Rosseev and also Deputy Chairman of the Management Committee at PJSC Gazprom, as well as representatives of key departments at PJSC Gazprom, Gazprom Export and Gazprom Neft.
subsidiary