Comp TIA Security + Certification Questions Part 3

An attacker uses a network sniffer to capture the packets of a transaction that adds $\mathrm{\$}$20 to a gift card. The attacker then user a function of the sniffer to push those packets back onto the network again, adding another $\mathrm{\$}$20 to the gift card. This can be done many times.
Which of the following describes this type of attack?