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If (r)n, denotes the number rrr... (n di...

If `(r)_n`, denotes the number `rrr... (n digits)`, where `r = 1,2,3,...,9` and `a=(6)_n,b=(8)_n,c=(4)_(2n)`, then

A

`a^(2)+b+c=0`

B

`a^(2)+b-c=0`

C

`a^(2)+b2c=0`

D

`a^(2)+b-9c=0`

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