Which one of the following techniques does not serve the purpose of early diagnosis of a disease for its early treatment?

1. A. (1) Recombinant DNA Technology
2. B. (2) Serum and Urine analysis
3. C. (3) Polymerase Chain Reaction (PCR) technique
4. D. (4) Enzyme Linked Immuno-Sorbent Assay (ELISA) technique

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