The most suitable option for Cumulus Cloud Bank to provide its customer service staff with real-time access to customer accounts, including the ability to view current transactions and balances, is to embed custom Lightning web components on the Account and Financial Account pages, and use custom Apex to make callouts to the core system services. This option allows the bank to leverage the Lightning Platform features and capabilities, such as Lightning web components, Apex, and callouts, to create a seamless and performant integration with their core systems. By using custom Lightning web components, the bank can create custom user interfaces that display the data from the core systems on the Account and Financial Account pages. By using custom Apex, the bank can write code that makes callouts to the core system services using HTTP requests and responses, and handle any authentication, error handling, or data transformation logic.

The following steps should be taken by the consultant to offer a high level of customization to boost user productivity for the wealth management division:
Create a Custom Field Set solely for the Wealth Managers without affecting the Investment Bankers. A Custom Field Set is a construct in Financial Services Cloud that allows you to define a collection of fields that can be displayed in a Lightning component, such as the Financial Summary or the Financial Account List. You can use Custom Field Sets to customize the fields that are relevant for different user groups or business scenarios, without modifying the underlying data model or page layout. You can create a Custom Field Set by going to Setup > Object Manager > Financial Account > Field Sets and adding or removing fields according to your requirements.
Assign the Custom Field Set to the Financial Summary component. The Financial Summary component is a Lightning component that displays aggregated financial data for a selected record, such as an account, contact, or opportunity. You can use the Financial Summary component to provide a holistic view of your client's financial situation and goals. You can assign a Custom Field Set to the Financial Summary component by using the Lightning App Builder and selecting the Custom Field Set from the Component Properties panel.
Assign the Custom Field Set To a Lightning component. A Lightning component is a reusable unit of user interface that can be added to any Lightning page, such as record pages, app pages, or Home pages. You can use Lightning components to enhance the functionality and user experience of your pages. You can assign a Custom Field Set to a Lightning component by using the Lightning App Builder and selecting the Custom Field Set from the Component Properties panel. Verified Reference: : Salesforce Help Article 1 : Salesforce Help Article 2 : Salesforce Help Article 3

Explanation
The following out of the box capabilities come with Financial Services Cloud Lead & Referral Management:
Referral Conversion: This capability allows you to convert a referral to an opportunity, a contact, or an account. You can use this capability to track the progress and outcome of a referral and measure its impact on your business.
Assigning a Referral: This capability allows you to assign a referral to another user, queue, or line of business. You can use this capability to route a referral to the appropriate person or team who can best meet the customer's need or interest.
Accepting a Referral: This capability allows you to accept a referral that is assigned to you or your queue. You can use this capability to acknowledge that you have received a referral and are ready to work on it. Verified References: : Salesforce Help Article 1 : Salesforce Help Article 3 : Salesforce Help Article 5

Explanation
The following expectations are from implementing multi language features in FSC:
Bankers in Japan have been accessing FSC in Japanese, but the new bankers in China will be accessing FSC in Chinese. This expectation means that FSC supports multiple languages and allows users to choose their preferred language for their user interface and data display.
In Seoul, South Korea, the branch managers will be reviewing their FSC dashboards every morning in Korean, while their colleagues in Shanghai, China, will be doing so in Chinese. This expectation means that FSC supports multiple languages for reports and dashboards and allows users to view them in their preferred language.