Refer to the exhibit. The control connection is failing. Which action resolves the issue?

Importing vSmart in vManage is an administrative onboarding step - if vSmart is already operational and the issue is a failed control connection, re-importing does not fix underlying reachability or connectivity problems.

Validating certificate authenticity addresses authentication failures after a connection is established at the transport layer - it does not help if vSmart is unreachable.

Uploading the WAN Edge list on vManage is required for device authorization, not for resolving a control connection failure between already-configured controllers.

Control connections in Cisco SD-WAN use DTLS or TLS over IP - if vSmart is unreachable at the network layer, no control connection can be established or maintained regardless of certificate status or configuration. Restoring reachability (routing, firewall rules, or interface state) to vSmart resolves the root cause shown in the exhibit where connectivity to vSmart is the failure point.