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Which of the following are convergent?

I. $\displaystyle\sum _{ n=1 }^{ \infty }{ \cfrac { e^{ n } }{ n } } $

II. $ \displaystyle\sum _{ n=1 }^{ \infty }{ \cfrac { n }{ e^{ n } } } $

III. $\displaystyle\sum _{ n=1 }^{ \infty }{ \cfrac { 1 }{ ne^{ n } } } $

A

I and II only.

B

I and III only.

C

II and III only.

D

III only.

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