What is the definition of gravitational potential energy?

I- It is the energy that an object has due to its position in space.
II- It is the energy that an object has due to its velocity.
III- It is the energy that an object has due to its mass.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and III are correct.
e) II and III are correct.