Where is the gravitational field zero and where is the gravitational potential zero, in case of Earth?

In a gravitational field, at a point where the gravitational potential is zero

In some region, the gravitational field is zero. The gravitational potential in this region

In some region, the gravitational field is zero. The gravitational potential in this region

In some region, the gravitational field is zero. The gravitational potential in this region is

Two bodies of masses M_(1) and M_(2) are kept separeated by a distance d. The potential at the point where the gravitational field produced by them is zero,the gravitational potential will be :-