Which of the following attacks saturates network resources and disrupts services to a specific computer?

A replay attack captures and retransmits valid authentication tokens or session data to impersonate a legitimate user; it targets authentication integrity rather than resource availability.

A teardrop attack sends malformed, overlapping IP fragments to crash a target's reassembly process and is a specific exploit technique targeting OS vulnerabilities rather than a broad resource saturation method.

A DoS attack works by flooding a target system with excessive traffic, malformed packets, or repeated requests that exhaust CPU, memory, or bandwidth, rendering services unavailable. This directly matches the question's description of saturating network resources and disrupting services to a specific computer. DoS attacks are defined by their goal of denying availability rather than stealing data or gaining unauthorized access.

A polymorphic shellcode attack mutates its own code signature to evade antivirus or IDS detection during exploitation and is unrelated to saturating network resources or disrupting service availability.