Arrange the Following Steps in the Enzymatic Process of the PCR

Multiple Choice

Arrange the following steps in the enzymatic process of the PCR cycle in the correct chronologic order:
1) Primer annealing
2) DNA denaturation
3) Extension of the primed DNA sequence

A) 1,2,3
B) 2,1,3
C) 2,3,1
D) 3,2,1