The correct statements from the following is 
(A) Conductivity always decreases with decrease in concentration for both strong and weak electrolyte.
(B)  The number of ions per unit volume that carry current in a solution increases on dilution 
(C) Molar conductivity $\left({\wedge }_m\right)$ increases with decrease in concentration.
(D) The variation in molar conductivity $\left({\wedge }_m\right)$ is different for strong and weak electrolyte