Explanation
My Domain is a feature in Salesforce that allows you to create a subdomain for your org. You need to enable My Domain to access Financial Services Cloud Lightning Components, such as Actionable Relationship Center, Relationship Map, Life Events & Business Milestones, etc. To enable My Domain, you need to do the following:
Register a subdomain using the My Domain wizard in Setup > My Domain.
Deploy it to your users after testing it in your sandbox or developer org. Verified References: :
Salesforce Help Article [7]

Explanation
To ensure the correct profiles and permissions for an API integration between Salesforce and a risk control system, the consultant should do the following steps:
Create a dedicated Integration User that will be used to authenticate and authorize the API calls between Salesforce and the risk control system. The Integration User should have a unique username, password, and security token that are not shared with other users or systems. The Integration User should also have the minimum permissions and access settings required to perform the integration tasks.
Create a new custom profile and ensure API Only is selected. The API Only option restricts the user from logging in to the Salesforce user interface, but allows the user to access the Salesforce API. The custom profile should also have the appropriate object permissions, field-level security, record types, page layouts, and other settings that are relevant for the integration. The custom profile should be assigned to the Integration User.

Explanation
To set up the new record types for Person Accounts, the administrator should configure Individual Record Type Mapper custom metadata. The Individual Record Type Mapper is a custom metadata type in Financial Services Cloud that defines how records are created when using certain features, such as Einstein Data Capture or Salesforce Inbox. The Individual Record Type Mapper maps Person Account record types to Individual record types, so that when a new Individual record is created from an email or calendar event, it automatically creates a corresponding Person Account record with the same record type. To configure Individual Record Type Mapper custom metadata, you need to go to Setup > Custom Metadata Types > Individual Record Type Mapper > Manage Records and create a new record for each Person Account record type and its matching Individual record type. Verified References: : Salesforce Help Article [8] : Salesforce Help Article [9]

Explanation
The following considerations indicate that a new Salesforce org is the better choice for implementing Financial Services Cloud:
The bank wants to use this project as an opportunity to retire customization. A new org will allow the bank to start fresh and avoid carrying over unnecessary or outdated customization that may conflict with Financial Services Cloud features or best practices.
The current implementation is using a product-centric view and the bank wants to move to a customer-centric view. A new org will allow the bank to adopt the Financial Services Cloud data model, which is designed to provide a holistic view of the customer and their relationships, goals, financial accounts, activities, and interactions.
Existing business capabilities and processes can be redesigned to deliver a higher business impact. A new org will allow the bank to leverage the Financial Services Cloud capabilities, such as Action Plans, Relationship Groups, Rollup By Lookup, Service Processes, etc., to optimize their business processes and enhance their customer experience. Verified References: : Salesforce Help Article 6