Why are Excel spreadsheets, paper filing systems, and customized software programs all examples of HRIS systems?

Question $17$ options:

Human resources can use these to make informed decisions since the data is stored electronically

Staff can use these to complete some of the human resources tasks themselves through employee self$-$service

They are all a means of acquiring, storing, manipulating, analyzing, retrieving and distributing pertinent information regarding an organization's human resources

Instant notification of changes to the company's policies can be sent through these since they are integrated with the company's communication system