Which of the following is correct for polymerase chain reaction $(\text{PCR})$?

Identify the correct sequence of steps in the Polymerase Chain Reaction $(PCR)$.

Given below are four statements pertaining to the separation of $DNA$ fragments using gel electrophoresis. Identify the incorrect statements:
$(a)$ $DNA$ is a negatively charged molecule and so it is loaded on the gel towards the Anode terminal.
$(b)$ $DNA$ fragments travel along the surface of the gel,whose concentration does not affect the movement of $DNA$.
$(c)$ The smaller the size of the $DNA$ fragment,the larger is the distance it travels through it.
$(d)$ Pure $DNA$ can be visualized directly by exposing it to $UV$ radiation.
Choose the correct answer from the options given below:

At which stage of $PCR$,does the template join with the primer?

Having become an expert on gel electrophoresis,you are asked to examine a gel for a colleague. Where would you find the smallest segment of $DNA$?

Which of the following range of temperature is required for denaturation,annealing of primer,and primer extension of $PCR$ respectively?