下列何序列最可能含有真核細胞RNA polymerase II聚腺苷酸化訊號（polyadenylation signal）？
5'-AUUCAUGUGCGGCGCGCCGCAGCUCCUAGCUUUUU-3'
5'-GUGCGGCGAUUCAUCGCCGCAGCUCCUAGCUUUUU-3'
5'-GUGCGGCGAUUCAUCGCCGCUUUUUAGCUCCUAGC-3'
5'-AAAAAUUUUUUAAUAAAAGGGGGGGGUUUUUUGG-3'
