Human Resource Management $($HRM$)$ is

a practice to ensure every day employee behaviors support the strategy of the organization.

practiced by everyone who interacts and makes managerial decisions concerning employees.

industry neutral as the practices can be applied to any industry and organization.

found in all departments in addition to HR$.$ An HR department may or may not have the oversight of the HRM systems, as the larger organizational structure would take precedent.

All of the above.