Which kind of isomerism is shown by the complex `[Co(NH_(3))_(5)(ONO)]SO_(4)` ?
1. Ionisation isomerism 2.Linkage isomerism
3. Geometrical isomerism 4. Optical isomerism.

Options

A. 1,2,3 and 4 are correct
B. 1,3 and 4 are correctly only
C. 1 and 2 are correct only
D. 2,3 and 4 are correct only

Explanation

To determine the type of isomerism shown by the complex \([Co(NH_3)_5(ONO)]SO_4\), we can analyze the ligands and their interactions with the central metal ion, cobalt (Co).

### Step 1: Identify the ligands
The complex contains:
- 5 ammonia (\(NH_3\)) ligands, which are neutral.
- 1 nitrito (\(ONO\)) ligand, which can coordinate through either the nitrogen (N) or the oxygen (O) atom.
- 1 sulfate (\(SO_4^{2-}\)) ion, which is outside the coordination sphere.