Explanation
Identification Document is the Financial Services Cloud object that should be recommended for storing client data on drivers' licenses and passports. Identification Document is a standard object that represents a document that verifies a person's identity, such as a driver's license, passport, or national ID card. You can create identification document records for individual clients and link them to their person accounts. You can also store information such as document type, number, issue date, expiration date, and country of issuance.
References: [Identification Document Object], [Manage Identification Documents]

Explanation
The following limitations should be considered before enabling Person Accounts in Financial Services Cloud:
Person Accounts cannot be disabled once they were enabled. Enabling Person Accounts is an irreversible action that affects your data model and user interface. You should carefully evaluate your business needs and test the functionality in a sandbox or developer org before enabling it in production.
Creating a client record via Salesforce Inbox is not supported. Salesforce Inbox is a feature that allows you to access Salesforce data and actions from your email application. However, you cannot use Salesforce Inbox to create a client record as a Person Account. You can only create a client record as an Individual Model record using Salesforce Inbox. Verified References: : Salesforce Help Article 4 :
Salesforce Help Article 5

Explanation
The following things must be kept in mind when creating Action Plan Templates:
When creating Action Plan Templates with the UI, you can designate a plan owner different from the plan creator. The plan owner is the user who is responsible for executing the tasks in the Action Plan.
The plan creator is the user who creates the Action Plan Template or the Action Plan from the template.
You can assign a different plan owner for each Action Plan Template or Action Plan.
An Action Plan is a run-time instance of the template that allows you to automate the sequence of the tasks you defined in the template. An Action Plan Template is a reusable blueprint that defines the tasks, owners, and deadlines for a common business process or service request. An Action Plan is a specific implementation of the template that applies to a particular target record, such as an account, contact, or opportunity.
When you create an Action Plan from a template for a specific target record, item deadlines are calculated using the start date and date offset defined in the Action Plan Template. The start date is the date when you create the Action Plan from the template. The date offset is the number of days before or after the start date when each task is due. You can specify different date offsets for each task in the template. Verified References: : Salesforce Help Article 2 : Salesforce Help Article 3 : Salesforce Help Article 4

Explanation
A Custom Relationship Group is a construct in Financial Services Cloud that allows you to model complex and dynamic relationships between clients and accounts. You can use it to represent collaborative customer business operations that are not captured by standard household or account structures. Verified References: :
Salesforce Financial Services Cloud Implementation Guide, page 67.