The rationalising factor of root(7)(a^(4...

The rationalising factor of `root(7)(a^(4)b^(3)c^(5))` is
(a) `root(7)(a^(3)b^(4)c^(2))`
(b) `root(7)(a^(3)b^(4)c^(2))`
(c) `root(7)(a^(2)b^(3)c^(3))`
(d) `root(7)(a^(2)b^(4)c^(3))`

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