Which tools can be used to monitor network traffic in Google Cloud?

The correct answer highlights tools specifically designed for monitoring network traffic within Google Cloud. VPC flow logs are a feature of Google Cloud that captures information about the forwarding of packets to and from network interfaces in Virtual Private Cloud (VPC). This logging provides insights into the metadata of the network traffic, such as source and destination IP addresses, ports, and the number of bytes sent or received.

Google Cloud Monitoring complements this by offering real-time visibility into resource performance and uptime by collecting metrics and providing dashboards for analyzing system and application metrics. By using both VPC flow logs and Google Cloud Monitoring, you can gain a comprehensive understanding of your network's performance and health, enabling you to troubleshoot and optimize as needed.

The other options do not provide relevant tools for monitoring network traffic within Google Cloud, as they are either general productivity tools or unrelated technologies that do not offer the capabilities needed for network traffic analysis.