Explanation/Reference:
The Network Activity tab of the Application Command Center (ACC) displays an overview of traffic and user activity on your network including:
Top applications in use
Top users who generate traffic (with a drill down into the bytes, content, threats or URLs accessed by the user)
Most used security rules against which traffic matches occur
In addition, you can also view network activity by source or destination zone, region, or IP address, ingress or egress interfaces, and GlobalProtect host information such as the operating systems of the devices most commonly used on the network.
Incorrect Answers:
A: The blocked activity tab focuses on traffic that was prevented from coming into the network. The widgets in this tab allow you to view activity denied by application name, username, threat name, blocked content
-files and data that were blocked by a file blocking profile.
B: There is no Bandwidth Activity tab in ACC.
C: The threat activity tab displays an overview of the threats on the network, focusing on the top threats:
vulnerabilities, spyware, viruses, hosts visiting malicious domains or URLs, top WildFire submissions by file type and application, and applications that use non-standard ports.
References: https://www.paloaltonetworks.com/documentation/70/pan-os/pan-os/monitoring/acc-tabs.html