Which is an example of an entity-level control?

Sales orders are rejected by the application when the amount exceeds the customer credit limit. 

Sales orders are reviewed and approved prior to recording revenue and billing. 

Strong tone at the top of the organization principles are communicated, emphasizing the importance of internal control. 

Bank reconciliations are performed by an individual, validating the differences between the general ledger and the bank and investigating any unreconciled differences.