Step 1: Understanding Human Resource Management. 
  
Human Resource Management (HRM) involves several activities that are crucial for managing an organization's workforce. These activities include recruiting, selecting, and training employees. All these steps are integral to HRM. 
Step 2: Analyzing the options. 
  
(A) Recruiting: Recruiting is indeed a part of HRM as it involves attracting potential candidates for job openings. 
  
(B) Selection: Selection is another essential part of HRM where the best candidates are chosen from the pool of applicants. 
  
(C) Training: Training employees is also a key function of HRM to ensure that employees have the necessary skills. 
  
(D) All of these: Correct. All of the activities mentioned above are part of Human Resource Management. 
Step 3: Conclusion. 
  
The correct answer is (D) All of these, as recruiting, selection, and training are all essential aspects of HRM.