If the binary operation o. is defined on...

If the binary operation `o.` is defined on the set `Q^+` of all positive rational numbers by `ao.b=(a b)/4dot` Then, `3o.(1/5o.1/2)` is equal to `3/(160)` (b) `5/(160)` (c) `3/(10)` (d) `3/(40)`

A

`(3)/(160)`

B

`(5)/(160)`

C

`(3)/(10)`

D

`(3)/(40)`

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A

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