Utilize the input text as a context reference, choose the right relationship between Petrofac and Public Limited Company from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

577.50p -2.86% Kaz Minerals (LSE: KAZ.L - news ) (KAZ) 149.60p -2.86% Tullow Oil (LSE: TLW.L - news ) (TLW) 211.90p -2.57% Telecom Plus (LSE: TEP.L - news ) (TEP) 1,073.00p -2.37% Petrofac Ltd. (PFC) 827.00p -2.36% UDG Healthcare Public Limited Company (UDG) 521.00p -2.25% FTSE TechMARK - Risers Torotrak (TRK) 6.25p +4.08% BATM Advanced Communications Ltd (Other OTC: BTAVF - news ) .

Answer: legal_form