Based on the following statements, choose the correct option:

Assertion: Heater wire must have high resistance and a high melting point.

Reason: If resistance is high, the electric conductivity will be less.

Assertion and reason are correct, but reason is not the correct explanation of the assertion.
Assertion: According to Joule’s law of the heating effect of electric current, the heat produced is directly proportional to the amount of resistance of the conductor at a given supply of current. 

So, the Heater wire must have high resistance and a high melting point is true.
Reason: Resistance and electrical conductivity are inversely related. When resistance is high, conductivity is low, and vice versa.

The electrical conductivity of a material is a measure of how easily it allows electric current to flow through it. 

So, If resistance is high, the electric conductivity will be less is also true. 

Therefore, the assertion and reason are correct, but the provided reason does not explain the assertion correctly.