The equities are Beco Petroleum Product Plc, Conoil Plc, Eterna Plc, Forte Oil PLC, Mobil Oil Nigeria Plc, MRS Oil Nigeria Plc, Total Nigeria Plc, Oando Plc and Seplat Petroleum Development Company Plc.
In the context of the input sentence, determine the relationship between 'Oando' and 'Petroleum'.
Options: owner of, product/material produced, owned by, subsidiary