Option A is correct because installing the Cloud Logging Agent on the VM ensures that logs written to the disk are automatically collected and sent to Cloud Logging, facilitating real-time analysis and troubleshooting. Option B is less efficient as it requires manual access to the serial console, which isn't scalable. Option C is unrelated to logging, focusing instead on instance health monitoring. Option D is incorrect because, without the Cloud Logging Agent, logs written to the disk won't appear in Cloud Logging by default.