| [ A ]    Electromagnetic | 
              |
| [ B ] Longitudinal | ![]()  | 
            
| [ C ] Polarised | |
| [ D ] Transverse | 
| [ A ]    Electromagnetic | 
              |
| [ B ] Longitudinal | ![]()  | 
            
| [ C ] Polarised | |
| [ D ] Transverse | 
| Answer : Option B | 
| Explanation : | 
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