What would be true for the structure labeled with letter ‘X’ in the given diagram showing the ultrastructure of Chlamydomanas?
| 1. | It is the region of the chloroplast where circular DNA is present |
| 2. | It is associated with the operation of a carbon-concentrating mechanism (CCM) |
| 3. | It is the inclusion body with accumulated toxic wastes for elimination |
| 4. | It is filled with air and is responsible for buoyancy of the organism |