Given figures represents the steps involved in polymerase chain reaction `(PCR)`. Identify the steps A,B,C and C and select the correct option.

Options

A. `{:(A,B,C,D),("Denaturation at " 94-96^(@)C,"Extension through Taq polymerase at " 72^(@)C,"Repetition of denaturation and annealing","Annealing at " 72^(@)C):}`
B. `{:(A,B,C,D),("Denaturation at " 94-96^(@)C,"Annealing at " 40-60^(@)C,"Extension through Taq polymerase at " 72^(@)C,"Repetition of denaturation and annealing"):}`
C. `{:(A,B,C,D),("Denaturation at " 40-60^(@)C,"Annealing at " 72^(@)C,"Extension through Taq polymerase at " 94-96^(@)C,"Repetition of denaturation and annealing"):}`
D. `{:(A,B,C,D),("Extension through Taq polymerase at " 72^(@)C,"Denaturation at " 40^(@)C,"Annealing at " 72^(@)C,"Repetition of denaturation and annealing"):}`

Answer

B