Correct Answer - Option 3 : resistance

__Resistance:__

- The property of any conductor that opposes the flow of electric current through it is called resistance.
- It is denoted by R and the SI unit is the ohm (Ω).
- The resistance of a metallic wire is directly proportional to its length and inversely proportional to its area of cross-section.

The resistance (R) is given by:

R = ρL / A

where ρ is resistivity, L is the length and A is the area of the cross-section.