Which of the following malware types typically has very high computing resource usage?

Rootkits are primarily designed to conceal their presence and the presence of other malware on a system. While they can affect system performance, their main objective is stealth rather than resource consumption. They typically do not engage in intensive computational tasks, making them less resource-hungry compared to cryptominers.

Boot sector viruses infect the boot sector of storage devices and execute during the startup process. While they can disrupt system operations, they do not inherently require high computing resources as their primary function is to spread and execute malicious code rather than consume substantial processing power.

Trojans are deceptive malware that trick users into executing them, often masquerading as legitimate software. While some Trojans can perform malicious activities that may use resources, they do not typically have the sustained high computing resource usage characteristic of cryptominers, as their operation often depends on the specific payload they deliver.