The question requires a real-time log analysis architecture that pushes logs to a third-party application. Cloud Logging exports to Pub/Sub (Option A) is the best approach because Pub/Sub is designed for real-time streaming and can handle large volumes of data efficiently. The third-party application can subscribe to the Pub/Sub topic to receive logs in real-time. Option D (Cloud Function) might seem viable, but triggering a function for every log entry is less scalable for high volumes compared to Pub/Sub. Options B (BigQuery) and C (Cloud Storage) are suited for batch processing or analytics, not real-time streaming.