When performing a projection, the ________ operator can be used to flatten nested structures.
- Flatten
- SelectMany
- Collapse
- Merge
The correct option is "SelectMany". In LINQ, the SelectMany operator is used to flatten nested collections or structures. It allows you to project each element of a sequence to a collection and then flattens the resulting sequences into one sequence. This is particularly useful when dealing with nested structures such as collections within collections.
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