A length-scale () depends on the permittivity (e) of a dielectric

A length-scale () depends on the permittivity (e) of a dielectric material, Boltzmann constant k , the absolute temperature T, the number per unit volume (n) of certain charged particles, and the charge (q) carried by each of the particles, Which of the following expressions(s) for  is(are) dimensionally  correct?
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Anurag Mishra Professor Asked on 23rd May 2016 in Physics.
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    Answer: (B)  & (D) 

    Anurag Mishra Professor Answered on 24th May 2016.
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