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A library has a copies of one Book, b co...

A library has a copies of one Book, b copies of each of two books, c copies of each of three books, and single copies of d books. The total number of ways in which these books can be distributed is

A

`((a+b+c+d))/(a,b,c,)`

B

`((a+2b+3c+d))/(a,(b,)^(2)(c,)^(5))`

C

`((a+2b+3c+d),)/(a,b,c,)`

D

none of these

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The correct Answer is:
B
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