Dictionaries are collections of key, value pairs, in which the keys are unique. Each key is associated with a specific value, allowing for efficient retrieval of values based on their corresponding keys. This definition accurately describes the properties and behavior of dictionaries in data structures.

The given graphic shows a sequence in UiPath where a string '2023' is being split with '2' as the delimiter. This operation divides the string into parts: before and after the delimiter. The result will be two substrings: an empty string before the first '2', and '03' after the second '2'. Therefore, the output at runtime will be an empty string and '03' being logged, which matches option B.

Folder roles can be assigned from the Folders page or from the folder's Settings page in an Orchestrator instance where Activate Classic Folders is unchecked under Tenant > Settings > General. This setting means that modern folders are being used, and role assignments for these folders are managed directly through the Folders settings or the Folders page.