Let a,bgt0 and alpha=(hati)/(a)+(4hatj)/...

Let a,bgt0 and `alpha=(hati)/(a)+(4hatj)/(b)+bhatk` and `beta=bhati+ahattj+(1)/(b)hatk`, then the maximum value of `(10)/(5+alpha*beta)` is

A

`(12)/(11)`

B

2

C

1

D

`(10)/(9)`

Verified by Experts

The correct Answer is:

A

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