What is an ionogram and what is it used for?

I. An ionogram is a blood test that measures the levels of the main electrolytes in the body: sodium, chloride, potassium, and bicarbonate.
II. An ionogram is used to evaluate the water and acid-base balance of the body and to detect electrolyte disorders.
III. An ionogram is used to evaluate the levels of calcium, phosphorus, magnesium, and manganese in the body.
IV. An ionogram is used to evaluate the functioning of the nervous and muscular systems.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I, II, and III are correct.
d) Only II and III are correct.