What is the synonym of 'bona fide'?

What is the synonym of 'bona fide'?

  1. a) Cheat
  2. b) Authentic
  3. c) Contaminate
  4. d) Adulterate

From the PGCB Assistant Engineer (CSE) April 2024 – Preliminary (BUET) exam, question 52 of 79.

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