When adding a new filename to the collection, which collection variable type will cause an error?

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A developer examines a workflow in which filenames are stored within a collection. The collection is initialized with a single filename.

When adding a new filename to the collection, which collection variable type will cause an error?
A . System.Collections.Generic. Dictionary
B . System.Array
C . System. Data. DataTable
D . System.Collections.Generic.List

Answer: B