Tokenized Sending is a feature in Marketing Cloud that allows sending messages with data that is too sensitive to store in Salesforce due to laws, regulations, or security policies. Tokenized Sending uses an API call to exchange data from an external system with Marketing Cloud at send time, without storing the data in Salesforce. Marketing Cloud Connect is a feature that enables integration between Marketing Cloud and other Salesforce clouds such as Service Cloud. When using Tokenized Sending with Marketing Cloud Connect, the following implications should be considered:
The synchronized data extensions will include the token and all PII attributes. Synchronized data extensions are tables in Marketing Cloud that store data from other Salesforce clouds using data synchronization in Marketing Cloud Connect. When using Tokenized Sending, the synchronized data extensions will include the token as well as all personally identifiable information (PII) attributes such as name, email, phone, etc. The token will serve as the subscriber key and contact key in Marketing Cloud, while the PII attributes will be used for personalization and segmentation.
The standard email address field for contacts and leads needs to be populated with a token. When using Tokenized Sending, the standard email address field for contacts and leads in other Salesforce clouds needs to be populated with a token instead of an actual email address. The token resembles a standard email address but contains encrypted information about the subscriber. The token is used to exchange data with the external system at send time and send messages to the actual email address.
Option B is incorrect because not all emails need to be sent through Marketing Cloud or Marketing Cloud Connect to avoid disruptions when using Tokenized Sending. However, it is recommended to do so to ensure consistent tracking and deliverability data across clouds. Option D is incorrect because the token with all supporting attributes does not need to be stored in Service Cloud when using Tokenized Sending. The token and the attributes are stored in the external system and only exchanged with Marketing Cloud at send time. Reference:
https://help.salesforce.com/s/articleView?id=sf.mc_overview_tokenized_sending1.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.mc_co_tokenized_sending.htm&type=0

The B2C Commerce to Service Cloud Connector is a solution that enables integration between B2C Commerce and Service Cloud. It allows displaying customer and order information in Service Cloud, creating orders on behalf of customers, and synchronizing customer data between the two systems. When introducing the Service Cloud Connector into an existing Salesforce Org, the following functionality considerations should be aware of:
In order to implement the Service Cloud Connector it is necessary to enable Person Accounts, a change which cannot be reverted once implemented. Person Accounts are a type of account in Salesforce that combines an account and a contact into a single record. The Service Cloud Connector requires Person Accounts to store customer information from B2C Commerce. Enabling Person Accounts is an irreversible change that affects the entire Salesforce Org and may have implications for other features or customizations.
The Service Cloud Connector is distributed as a managed package that can be extended to meet client-specific needs but with core functionality that cannot be altered. A managed package is a collection of application components that can be installed from AppExchange or other sources. The Service Cloud Connector is a managed package that provides core functionality for integrating B2C Commerce and Service Cloud. The core functionality cannot be modified or deleted, but it can be extended or customized using Apex code, Visualforce pages, or Lightning components.
Option C is incorrect because the Service Cloud Connector does not natively support accounts and contacts, households, and multi-brand customer models. It only supports person accounts as a customer model by default. Option D is incorrect because the Service Cloud Connector provides a collection of Lightning components that display customer and order information within Service Cloud, which do not need to be customized or deployed by a developer. Reference:
https://help.salesforce.com/s/articleView?id=sf.icx_b2c_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.accounts_person.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.distribution_installing_packages.htm&type=5