When I saw the violin in the window, I thought it was beautiful. When I read the card beside it, it said, "This violin was played by Beethoven." First I rolled my eyes, but then I looked at the price! The violin cost $4 million! It was then I realized it was a bona fide claim. Based on the context clues, what does “bona fide” most likely mean?

authentic
musical instrument
good luck charm
gold coin