One of the key differences between operational systems and data warehouses is:
Operational systems focus on business processes; data warehouses focus on business strategies
Operational systems focus on historical data; data warehouses contain current data
Operational systems are available 24x7; data warehouses are available during business hours
Operational systems focus on data quality; data warehouses focus on data security
Operational systems focus on current data; data warehouses contain historical data
E is correct