If the ENS field is changed to 'Y', what is included in the search?

When the ENS (Entity Name Search) field is set to 'Y', it indicates that a comprehensive search is being conducted that includes not just the surname but also the first name and middle name. This setting allows for a more thorough and effective retrieval of data related to an individual, ensuring that variations or combinations of names do not result in missed entries. The inclusion of all name components—surname, first name, and middle name—helps to maximize the accuracy of the search results and enhances the ability to locate the right individual in databases.

In contrast, other answer options that suggest limiting the search to only the surname or first name would not utilize the full potential of the ENS feature, thereby reducing the chances of finding the correct information. Therefore, the correct understanding of the ENS function clearly supports the conclusion that a combination of a surname, first name, and middle name is what is included in the search when the ENS field is marked as 'Y'.