Reference: Create and View Custom ARC Graphs | Salesforce Help
Explanation: A flex card is a Lightning web component that displays information about a node in the Actionable Relationship Center (ARC). A flex card can be customized to show different fields, actions, and related lists for different node types. Developers can reference the flex card in the Display properties of the custom ARC relationship graph to configure how each node is displayed in ARC.

The recommended approach for implementing Financial Services Cloud at Lake Tahoe Bank is to implement Financial Service Cloud in a new org (Green Field) and redesign business capabilities in the new org. This approach allows Lake Tahoe Bank to leverage the best practices and features of Financial Services Cloud without being constrained by their existing customizations and data model. It also minimizes the impact on users during implementation, as they can continue to use their current system until the new org is ready to go live. A green field implementation requires careful planning, data migration, and change management, but it can result in a more efficient and customer-centric solution. Verified Reference: : Salesforce Financial Services Cloud Implementation Guide, page 8.

A screen flow is a type of flow that guides users through a seriesof screens to complete a task or collect information2. Screen flows can alsointeract with external systems using Apex actions or invocable actions3.
Inthis case, the consultant can create a screen flow that collects the caller's name and social security number from the agent, and then invokes an Apex action or an invocable action that makes a web service call to an external authentication service.