Consider the following statements about enzymes used in recombinant DNA technology:

A. Restriction endonucleases cut DNA at specific sequences, creating either blunt or sticky ends.

B. DNA polymerase I from Escherichia coli is used to synthesize cDNA from mRNA.

C. Terminal deoxynucleotidyl transferase (TdT) adds nucleotides to the 3' ends of DNA without the need for a template.

D. RNase H specifically degrades the RNA strand of RNA-DNA hybrids.

Which combination of statements is correct?