The correct option is D All of the above
Electrolytes are of three kinds- acids, bases and salts.
For example HCl is an acidic electrolyte which dissociates into H+ and Cl− ions when dissolved in water.
NaOH is a basic electrolyte which dissociates into Na+ and OH− ions when dissolved in water.
KCl is a salt which gives K+ and Cl− ions when it is dissolved in water.