Which of the following tools of recombinant DNA technology is INCORRECTLY paired with its use?

A.	restriction endonuclease - production of DNA fragments for gene cloning.
B.	DNA ligase - enzyme that cuts DNA, creating sticky ends.
C.	DNA polymerase - copies DNA sequences in the polymerase chain reaction.
D.	reverse transcriptase - production of cDNA from mRNA.
E.	electrophoresis - RLFP analysis.