How can you save memory when storing color information in Red-Black tree?

How can you save memory when storing color information in Red-Black tree? Correct Answer using least significant bit of one of the pointers in the node for color information

The node pointers can be used to store color with the help of significant bits. the exceptions of this method are in languages like java where pointers are not used this may not work.
Bissoy MCQ

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Cosider the below formations of red-black tree. All the above formations are incorrect for it to be a redblack tree. then what may be the correct order?
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