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20 pts!!!

The CRISPR system allows biologists to alter the nucleotide sequence of specific genes. Which of these tasks could theoretically be achieved by applying the CRISPR system instead of other techniques of genetic engineering?

A. transferring a functional gene from one organism to another
B. deactivating a disease-causing gene
C. replacing a defective gene with a normal gene
D. determining whether two DNA samples came from the same source