all industries have to necessarily train the apprentices
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            industries have to train apprentices according to their requirement
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            all industries employing more than 100 workers have to recruit apprentices
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            only industries employing more than 500. workers have to recruit apprentices