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If a^2+b^2+c^2+84= 4(a-2b+4c),then the v...

If `a^2+b^2+c^2+84= 4(a-2b+4c)`,then the value of `sqrt(ab-bc+ca)` is :
यदि `a^2+b^2+c^2+84= 4(a-2b+4c)`,तो `sqrt(ab-bc+ca)` का मान क्या होगा ?

A

a)`5 sqrt10`

B

b)`4 sqrt10`

C

c)`2 sqrt10`

D

d)`sqrt10`

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