Which are the key features shared by schizophrenia, schizophreniform disorder, and brief psychotic disorder?

The key feature shared by the 3 disorders are the schizophrenic symptoms, which are delusions, hallucinations, or grossly disorganized or catatonic behavior, language disorder, disorganized speech, and social isolation.

But the three illnesses differ in the duration of symptoms:

In schizophrenia, it is six months or more,
Schizophreniform disorder last at least a month but less than six months.
And brief psychotic disease express one of the schizophrenic symptoms, and last few days but less than one month.

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.