Which of the following are valid definitions of the core of the Human Resource Management concept? I. The role of Human Resource Management is to ensure that the company's human resources provide a competitive advantage. II. Human Resource Management is about policies, practices, and systems that influence employees' behaviors, attitudes, and performance III. The core of Human Resource Management is to guide the company's strategy formulation. IV. Human Resource Management is becoming less important in companies of a substantial size, take good care of line-managers training and have a high level of coordination. Group of answer choices I, II and III are correct all of the statements are correct II and III are correct I and II are correct I, III and IV are correct