How is the polymerase chain reaction (PCR) helpful in the process of genetic testing?

How is the polymerase chain reaction (PCR) helpful in the process of genetic testing?
A)Preserving genetic material within a sample so that more sophisticated tests can be performed as they become available with future technologic advancements
B)Separating exons from introns and establishing which DNA strand is the “sense” strand
C)Determining whether a small amount of DNA is paternal or maternal in origin
D)Increasing the amount of DNA being tested, thus promoting accuracy

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