What are MSDS sheets and where should they be kept?

Option 1: Material Safety Data Sheets that provide information about hazardous chemicals. They should be kept on-site where the chemicals are used.
Option 2: Material Safety Data Sheets that provide information about non-hazardous chemicals. They should be kept in a central office.
Option 3: Maintenance and Safety Data Sheets used for equipment maintenance. They should be kept with the equipment.
Option 4: Material Storage and Distribution Sheets used to track inventory. They should be kept in a warehouse.