What is the effect of the overload keyword in a static NAT translation configuration?

Question:
What is the effect of the overload keyword in a static NAT translation configuration?

• It enables port address translation.
• It enables the use of a secondary pool of IP addresses when the first pool is depleted
• It enables the inside interface to receive traffic.
• It enables the outside interface to forward traffic.

Explanation: http://www.firewall.cx/networking-topics/network-address-translation-nat/233-nat-overload-part-1.html

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