Which was the first interstellar asteroid to be found?

A. Borisov
B. Narisor
C. Magnsor
D. Oumuamua

Oumuamua is the first known interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope at Haleakala Observatory, Hawaii, on 19 October 2017, 40 days after it passed its closest point to the Sun on 9 September.