What mistake might have led to the discrepancy between your proposed equation y = 4a^(x+4) - 1 and the correct answer y = (1/3)^(x+4) + 2?
A) Incorrect application of exponent rules in simplifying the equation.
B) An error in determining the value of the constant 'a' in your proposed equation.
C) Misinterpretation of the graph, leading to an inappropriate form for the equation.
D) Failure to consider the correct vertical shift in your proposed equation.