Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction) ?

The sequence of steps in polymerase chain reaction is denaturation, annealing and extension. The denaturation step generates templates by converting a dsDNA into ssDNA at high temperature (94°C). Annealing involves addition of primer and its hydrogen bonding with the template DNA at 72°C. Extension involves addition of dNMPs to the primer by polymerisation reaction carried out by heat stable DNA polymerase (72°C). When these three steps are repeated many times, the desired segment of DNA can be amplified approximately up to 1 billion copies.