In order to create an object storage where each object would be stored only once, you may use which of the following? (Choose 2)

In order to create an object storage where each object would be stored only once, you may use which of the following? (Choose 2)
A . SplFixedArray
B . SplObjectStorage
C . SplString
D . spl_object_hash
E: spl_same_object

Answer: B, D

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