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If `NN` denotes the set of all positive integers and if `f:NN rarrN` is defined by `f(n)=` the sum of positive divisors of n then `f(2^(k).3)`, where k is a positive integer is

A

`2^(k+1)-1`

B

`2(2^(k+1)-1)`

C

`3(2^(k+1)-1)`

D

`4(2^(k+1)-1)`

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DIPTI PUBLICATION ( AP EAMET)-FUNCTIONS-EXERCISE 1A(FUNCTIONS)
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