You have an oligonucleotide probe that hybridizes to part of gene A from a eukaryotic cell. Indicate in which applicatio

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You have an oligonucleotide probe that hybridizes to part of gene A from a eukaryotic cell. Indicate in which application where using cDNA library will be useful than a genomic DNA library.
A.) You want to study the promoter of gene A.
B.) Gene A encodes a tRNA and you wish to isolate a piece of DNA containing the full-length sequence of the tRNA.
C.) You discover that gene A is alternatively spliced and you want to see which predicted alternative splice products the cell actually produces.
D.) You want to find both gene A and the genes located near gene A on the chromosome.