N Characters of information are held on ...

N Characters of information are held on magnetic tape, in batches of x characters each, the batch processing time is `alpha + beta x^2 `seconds, `alpha and beta` are constants. The optical value of x for fast processing is

A

`alpha//beta`

B

`beta//alpha`

C

`sqrt(alpha//beta)`

D

`sqrt(beta//alpha)`

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The correct Answer is:

C

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