Is the minimum of 5 seats for Dynamics 365 Human Resources is valid? And if yes, does they mean 5 Dynamics 365 Human Resources (Manager) licenses or cna it be 1 manager license and 4 Self Service licenses?

Is the minimum of 5 seats for Dynamics 365 Human Resources is valid? And if yes, does they mean 5 Dynamics 365 Human Resources (Manager) licenses or cna it be 1 manager license and 4 Self Service licenses?