The derivative of a function f(x) at x=a is given by the limit as x approaches -4 of the square root of 29+x minus 5, all divided by x+4. Find the function f(x) and the value ofA.

Options:
A. f(x) = a = ?
B. What is the function f(x) and the value of a?
C. Determine the function f(x) and the value ofA.
D. Find the function f(x) and the value ofA.