Design an experiment using cDNA libraries to identify genes expressed in response to a specific environmental stress.

• A. Expose cells to the stress, isolate proteins, create cDNA library, sequence to identify expressed genes.
• B. Isolate genomic DNA, create genomic library, sequence to identify expressed genes.
• C. Use restriction enzymes to cut mRNA, insert into vectors, sequence to identify expressed genes.
• D. Expose cells to the stress, isolate mRNA, create cDNA library, sequence to identify expressed genes.