For how many values of $a$ is it true that the line $y=x+a^{2}-a-3$ passes through the vertex of the parabola $y=x^{2}-6x+a^{2}$? (Adapted From 2005 AMC 12B Problem, Question \#8) 
选项为:A:$$0$$  B:$$1$$  C:$$2$$  D:$$10$$  E:infinitely many  请回答其中一个选项.