Which of the following statements about telomere is correct?()

A. Telomeres are special structure composing of nucleosomes in the end of eukaryotic chromosomes
B. Telomeres can stable DNA secondary structure
C. Telomerases act as template as well as reverse transcriptase
D. Cell aging is related to the abnormal extend of telomere
E. Telomere refers to the DNA sequences in the end of linear chromosome which are rich in guanine nucleotide