Which of the following correctly outlines the steps for constructing a cDNA library?

• A. Isolate genomic DNA, digest with restriction enzymes, insert into vectors, transform into host cells.
• B. Isolate proteins, reverse transcribe into DNA, insert into vectors, transform into host cells.
• C. Isolate mRNA, digest with restriction enzymes, insert into vectors, transform into host cells.
• D. Isolate mRNA, reverse transcribe into DNA, insert into vectors, transform into host cells.

Answer: (D)