What is a key benefit of using the @InvocableMethod annotation over traditional methods?

The key benefit of utilizing the @InvocableMethod annotation lies in its provision for bulk operation functionality. When you declare a method with this annotation, it allows that method to be invoked in bulk from Process Builder or Flow. This means multiple records can be processed in a single call rather than needing to handle each record individually.

This capability enhances efficiency and performance, especially when multiple records are involved, as it minimizes the number of Apex calls and maximizes processing speed. Additionally, the handling of collections as input and output becomes seamless, making it easier to work with larger datasets without running into governor limits that could occur with traditional methods that handle single records.

With this understanding, the other options, while they may have their own significance within the context of Salesforce development, do not specifically address the unique capabilities provided by @InvocableMethod.