What is the difference between mass and weight?

Mass is the measure of a body's inertia, while weight is the measure of the force that gravity exerts on a body.
The weight depends on the position and acceleration of the body, while the mass is constant.
The unit of mass in the International System of Units is the kilogram, while the unit of weight is the newton.
a) Only the first statement is correct.
b) Only the second statement is correct.
c) Both statements are correct.
d) Both statements are incorrect.