Which of the following is an example of a valid use of the addition property of equality?

a.
to isolate the g in the equation g – 4 = 0, add 4 to both sides of the equation
b.
to isolate the g in the equation g – 4 = 0, subtract 4 from both sides of the equation
c.
to isolate the g in the equation –4g = 0, add 4 to both sides of the equation
d.
to isolate the g in the equation –4g = 0, subtract 4 from both sides of the equation