The derivative of a function, f(x), at x=a, is given by which of the following limits?

A) \lim_(x->-4)(\sqrt(29+x)-5)/(x+4)
B) \lim_(x->-4)(\sqrt(29+x)+5)/(x+4)
C) \lim_(x->4)(\sqrt(29+x)-5)/(x+4)
D) \lim_(x->4)(\sqrt(29+x)+5)/(x+4)
What is the value of f(x) and a?

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