What rules need to be followed when converting active voice sentences to passive voice in English? Which of the following options are correct?

A、The subject of the active sentence becomes the object of the passive sentence.
B、The passive sentence uses the auxiliary verb 'be' plus the past participle.
C、The object of the active sentence becomes the subject of the passive sentence.
D、The subject of the passive sentence must be visible in the sentence.
E、The tense of the passive sentence remains consistent with the active sentence.