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The situation described involves Bruce using a radio transmitter to interfere with Wi-Fi access, which characterizes a jamming attack. In this context, jamming refers to the deliberate transmission of signals that disrupt the communication between devices, effectively blocking or degrading the performance of the Wi-Fi network.

Jamming attacks exploit the nature of wireless communication, where the signals can be interrupted by disruptive frequencies. The goal of such an attack is to prevent users from connecting to the network or to degrade the quality of the connection, causing frustration and potential loss of service. It's a targeted approach that disrupts access to resources without needing to compromise data directly.

Other options, although they involve security threats, do not fit the described scenario. Phishing attacks involve tricking individuals into revealing sensitive information, which is not related to signal interference. A man-in-the-middle attack refers to an attacker intercepting and potentially altering the communication between two parties, again not relevant to the act of jamming. Denial of Service attacks typically involve overwhelming a service with requests but can be confused with jamming; however, in this case, the emphasis is on disrupting radio transmission specifically. Therefore, the appropriate characterization of Bruce's actions is a jamming attack.