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If abcd = 1, where a,b,c and d are posit...

If abcd = 1, where a,b,c and d are positive real numbers, then find the minimum value of `a^(2) + b^(2) + c^(2) + d^(2) + ab + ac + ad + bc + bd + cd`.

A

6

B

10

C

12

D

20

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