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If `sqrt(10-2 sqrt21)+ sqrt(8+2 sqrt15)= sqrta+ sqrt b`, where a and b are positive integers, then the value of `sqrt(ab)` is closest to :
यदि `sqrt(10-2 sqrt21)+ sqrt(8+2 sqrt15)= sqrta+ sqrt b` है, जहाँ a और b धनात्मक पूर्णाक है, तो `sqrt(ab)` का मान ( लगभग ) ज्ञात करें |

A

`4.6`

B

`5.9`

C

`6.8`

D

`7.2`

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The correct Answer is:
B
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