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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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