Consider the following statements and select the correct answer from the codes given below:
Assertion (A): Reciprocal of resistivity is called specific conductance.
Reason (R): Reciprocal of resistance is called the thermal conductivity.
1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. A is true but R is false
4. A is false but R is true