he first figure is the output of the "show control connections" command. From this figure we learned that the 192.168.100.82 so we need to connect to this IP address (not 192.168.100.80).

IP SLA (Service Level Agreement) tracking might fail due to several reasons, but based on the options provided: B. A route back to the R1 LAN network is missing in R2 - If R2 does not have a proper route back to the source of the IP SLA operation (R1's LAN network), it cannot send return traffic, causing the IP SLA operation to fail. C. The source-interface is configured incorrectly - If the source interface for IP SLA is not correctly configured or does not have connectivity, it will result in failures because IP SLA operations depend on correct source interface configuration for sending probes.

Explanation:
Table Description automatically generated with medium confidence

The ISAKMP SA has been authenticated. If the router initiated this exchange, this state transitions immediately to QM_IDLE, and a Quick Mode exchange begins.
https://www.ciscopress.com/articles/article.asp?p=606584

Explanation
Cisco Stealthwatch is a comprehensive, network telemetry-based, security monitoring and analytics solution that streamlines incident response through behavioral analysis; detecting denial of service attacks, anomalous behaviour, malicious activity and insider threats. Based on a scalable enterprise architecture, Stealthwatch provides near real-time situational awareness of all users and devices on the network.
Reference: https://www.endace.com/cisco-stealthwatch-solution-brief.pdf Note: Although answer A seems to be correct but in fact, Stealthwatch does not provide real-time protection for DDoS attack. It just helps detect DDoS attack only.
Stealthwatch aggregates observed network activity and performs behavioral and policy driven analytics against what it sees in order to surface problematic activities. While we don't position our self as a DDOS solution, we're going to leverage our analytical capabilities to identify a DDoS attack against an internal host using the WebUI.
Reference: https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2016/pdf/LTRSEC-8421-LG.pdf