Stumped in an Interview: What Are the Core Pillars of Human Resource Management?

Can anyone please tell me what the pillars of Human Resource Management are? Actually, this question was asked to me in an interview, but I could not answer.

Dear Vicky, there are several pillars of HRM, and the central pillar of HR is the value of human resources. The HR Department measures and constantly searches for newer ways to add value to human resources. By adding value to human resources, the HR Department adds value to the enterprise.

In the recent past, there was a similar query to your question. You may refer to the following link: https://www.citehr.com/518830-what-f...ml#post2209410

Thanks,
Dinesh Divekar