Find the critical points of the following function.
f(x,y) = x^2 - 5xy + 6y^2 + 4x - 6y + 3
What are the critical points? Select the correct choice below and, if necessary, fill in the answer box within your choice.
A. The critical point(s) is/are
(Simplify your answer. Type an ordered pair. Use a comma to separate answers as needed.)
B. There are no critical points.