Classify each acid as strong or weak. Select the single best answer for each part.

To classify each of the given acids as strong or weak:

1. **HBr (Hydrobromic acid)**: Strong acid. HBr completely ionizes in water.

2. **HClO2 (Chlorous acid)**: Weak acid. HClO2 does not completely ionize in water.

3. **HIO2 (Iodous acid)**: Weak acid. Similar to HClO2, HIO2 does not fully ionize in water.

So the classifications are:
- HBr: Strong
- HClO2: Weak
- HIO2: Weak