What approach should be recommended for performing an email send to a subset of a Synchronized Data Extension?

The recommended approach for performing an email send to a subset of a Synchronized Data Extension involves using appropriate methods to ensure that the data being sent is relevant and well-targeted. The correct answer highlights the importance of using Data Filters or Query Activities to create a Sendable Salesforce Data Extension, allowing you to effectively segment your audience based on specific criteria.

By leveraging Data Filters, you can dynamically segment the data within a Synchronized Data Extension, allowing for targeted marketing efforts. This capability is crucial when you want to focus on particular groups within a larger data set, ensuring that your email communications are personalized and relevant to recipients.

Query Activities can also be utilized for more complex criteria and SQL-based queries to define exactly which records are included for your email send. Both these methods allow for a high degree of flexibility and precision in aligning your email campaigns with your marketing goals.

In contrast, other options focus on different aspects of data synchronization. While syncing Sales Cloud objects to the Marketing Cloud is useful for data consistency, it does not specifically address the need for segmentation necessary for targeted email sends. The essence of targeted emailing lies in how you segment and filter the data, making the use of Data Filters or Query Activities the most effective approach in this scenario.