What is the formula to calculate the deficit of water in hypernatremia?

The deficit of water in hypernatremia can be corrected in 24 hours.
The formula to calculate the deficit of water is (Na/140) - 1) x 0.5.
The deficit of water can be passed through intravenous route with dextrose 5% or water, depending on the patient's condition.
a) Only afirmation I is correct.
b) Afirmations I and II are correct.
c) Afirmations II and III are correct.
d) All afirmations are correct.