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A dimensionless quantity is constructed in terms of electronic charge e, permittivity of free space    Planck's constant h, and speed of light c. If the dimensionless quantity is written as e   0  γ h c  and n is a non-zero integer, then (  ,  ,  ) is given by

1. (2n, – n, – n, –n)
2. (n, – n, – 2n, –n)
3. (n, – n, – n, –2n) 
4. (2n, – n, –2n, –2n)

Correct answer: (2n, – n, – n, –n)

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