In which configuration would an outbound ACL placement be preferred over an inbound ACL placement?

Question:
In which configuration would an outbound ACL placement be preferred over an inbound ACL placement?

• when the ACL is applied to an outbound interface to filter packets coming from multiple inbound interfaces before the packets exit the interface
• when a router has more than one ACL
• when an outbound ACL is closer to the source of the traffic flow
• when an interface is filtered by an outbound ACL and the network attached to the interface is the source network being filtered within the ACL

Explanation: An outbound ACL should be utilized when the same ACL filtering rules will be applied to packets coming from more than one inbound interface before exiting a single outbound interface. The outbound ACL will be applied on the single outbound interface.

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