Explanation:

There are two types of isomers possible for the given molecule. They are:

1. Coordination isomers: In coordination isomers, the ligands attached to the central metal ion are different, but the overall composition is the same.

2. Geometric isomers: In geometric isomers, the ligands attached to the central metal ion are the same, but their arrangement in space is different.

Calculation:

The complex has four ammonia molecules, one chloride ion, and one nitro group. The ammonia molecules are neutral ligands, while the chloride ion and the nitro group are negatively charged ligands.

There are two ways to arrange the negatively charged ligands in the complex:

1. Chloride ion and nitro group can be arranged adjacent to each other.

2. Chloride ion and nitro group can be arranged opposite to each other.

For each of these arrangements, there are two ways to attach the neutral ligands to the central metal ion:

1. Four ammonia molecules can be attached in a plane.

2. Three ammonia molecules can be attached in a plane, and one can be attached above or below the plane.

Therefore, the total number of isomers possible for the molecule [Co(NH3)4Cl(NO2)] is 2 x 2 = 4.

Hence, the correct answer is between '4.0,4.0'.