Which statement about list element counts is true?

• A. They must always be identical across features.
• B. They can vary between features.
• C. They are always zero.
• D. They are always even.

Answer: (B)

List element counts indicate how many elements are in a feature’s list attribute. In FME, lists are per-feature data structures, and there is no requirement that every feature’s list has the same length. That means the count can differ from feature to feature—even within the same dataset. Some features may have an empty list, giving a count of zero, while others may contain several items. Since there’s no universal length rule, the statement that these counts can vary between features is the accurate one. The other statements aren’t correct because lists can differ in length, aren’t required to be zero, and aren’t required to be even.