Which of followeing comets reappears after shortest periods a briela's comet b di vico's comet c hairlay's comet d donati's comet?

Answer:- Briela's comet appears after 6.6 years. Its correct name is biela's comet. Di vico is not comet. Halley appears after 76 years. Donati is a non period comet. It appeared once only in 1858. I think correct answer is Biela's comet. If there is any other opinion mail me.