Please provide the answer to this question very very very urgently!!!

Dear student,
Please find below the answer:

Option (a) is correct.
PCR detects single nucleotide or multiple nucleotides changes which prevent amplification of a part of DNA fragment which can be visualized by electrophoresis or by real-time fragment changes. PCR can detect the presence of a pathogen even before it produces any symptoms.

Hope this clears your doubt.
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