Which of the following BEST describes a network-based attack that can allow an attacker to take full control of a vulnerable host?

A remote exploit specifically leverages a security flaw in a network-accessible service or application on a target host to execute arbitrary code or gain a command shell. This typically grants the attacker elevated privileges or full administrative control over the compromised system, fulfilling the criteria of taking full control of a vulnerable host over a network.

Amplification attacks are a type of Denial-of-Service (DoS) attack where an attacker uses legitimate services to magnify traffic volume directed at a victim, aiming to overwhelm rather than gain control of a host.

Sniffing is a passive reconnaissance technique involving the capture and analysis of network traffic, primarily for information gathering, not for gaining control over a host.

A Man-in-the-Middle (MITM) attack involves an attacker intercepting and potentially altering communication between two parties, but it does not inherently provide full control over the endpoint hosts themselves.