If,f(x) and g(x) are two functions having finite non-zero third order derivatives f''''(x) and g''' (x) for all x ∈ R. If f(x) . g(x) = 1 for all x ∈ R, then f'''/f' - g'''/g' is equal to
(a) 3(f''/g - g''/f)
(b) 3(f''/f - g''/g)
(c) (g''/g - f''/f)
(d) (f''/g - g''/f)
