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MongoDB supports spherical surface calculations on legacy coordinate pairs using a _______ index.

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MongoDB supports spherical surface calculations on legacy coordinate pairs using a _______ index.

(a) 2dsphere

(b) 2d

(c) geoHaystack

(d) all of the mentioned

The question was asked in semester exam.

I need to ask this question from Index Types in division Index/Indexing Concepts of MongoDB

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Correct answer is (a) 2dsphere

To elaborate: If you choose flat surface calculations via a 2d index, you can store data only as legacy coordinate pairs.

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