How to align a node vertical to one node and horizontal to another node?

Question

Is it possible to align node c vertical to node a and horizontal to node b. If I combine the "below=of" and "right=of" parameter, Tikz ignores the first one.

\begin{tikzpicture}
  \node[draw, circle, xshift=2cm](a){A};
  \node[draw, circle, minimum width=2cm, yshift=-2cm](b){B};
  \node[draw, below=of a, right=of b](c){C};
\end{tikzpicture}

Answer 1

You can use the orthogonal identifiers |- and -| for intersections of different coordinates. A quick reading hint is go vertical | and then horizontal - or vice versa.

\begin{tikzpicture}
  \node[draw, circle, xshift=2cm](a){A};
  \node[draw, circle, minimum width=2cm, yshift=-2cm](b){B};
  \node[draw](c) at (a|- b){C};
\end{tikzpicture}