A binary system, like Cygnus X-1, may have a black hole in it if the following is known about it: (2 answers)choices:the black hole is unseen and its mass is less than 3 solar massesthe system emits infrared radiationthe black hole is unseen and its mass is more than 3 solar massesthe event horizon can be observedthe system emits x raysthe singularity can be observed