Explanation:

Physicist Stephen Hawking, one of the creators of modern theory on black holes, has now questioned the existence of the phenomenon known as event horizon around them. Mening, so far typical black hole is specified by a “horizon”.
Event horizon is the Boundary marking the limits of a black hole. Nothing that enters a black hole can get out or can be observed from outside the event horizon. Likewise, any radiation generated inside the horizon can never escape beyond it.

Hence option 2nd is correct.