Which of the Following Is a Guideline for Balancing a Redox

Which of the following is a guideline for balancing a redox equation in acidic solution by the half-reaction method?

A) Write a half-reaction for the substance oxidized and the substance reduced.
B) Balance the atoms in each half-reaction;balance oxygen with water and hydrogen with H+.
C) Multiply each half-reaction by a whole number so that the number of electrons lost by the substance oxidized is equal to the electrons gained by the substance reduced.
D) Add the two half-reactions together and cancel identical species on each side of the equation.
E) all of the above