Transcription and Regulation
Immediately after transcription

both (a) and (b)
a poly adenylation signal is added
a methylated guanine cap is added to the 51 end of the transcript
a methylated guanine cap is added to the 31 end of the transcript

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Transcription and Regulation
Most transcripts of protein coding genes are cleaved

at the 5' end immediately before a poly adenylation signal
at the 3' end just after a poly adenylation signal
at the 5' end immediately after a poly adenylation signal
at the 3' end just before a poly adenylation signal

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