The figure below shows three steps (A, B, C) of polymerase chain reaction ( PCR). Select the option giving correct identification together with what it represents?
![A refined two-step oligoribonucleotide interference-PCR method for precise discrimination of nucleotide differences | Scientific Reports A refined two-step oligoribonucleotide interference-PCR method for precise discrimination of nucleotide differences | Scientific Reports](https://media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-35479-0/MediaObjects/41598_2018_35479_Fig4_HTML.png)
A refined two-step oligoribonucleotide interference-PCR method for precise discrimination of nucleotide differences | Scientific Reports
![A refined two-step oligoribonucleotide interference-PCR method for precise discrimination of nucleotide differences | Scientific Reports A refined two-step oligoribonucleotide interference-PCR method for precise discrimination of nucleotide differences | Scientific Reports](https://media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-35479-0/MediaObjects/41598_2018_35479_Fig3_HTML.png)