Phép tính nào dưới đây đặt tính đúng?

$\begin{array}{l}+\underset{¯}{\begin{array}{l}23168\\ 5451\end{array}}\\ 77678\end{array}$

$\begin{array}{l}-\underset{¯}{\begin{array}{l}52413\\ 3259\end{array}}\\ 20923\end{array}$

$\begin{array}{l}+\underset{¯}{\begin{array}{l}16340\\ 52035\end{array}}\\ 68375\end{array}$

$\begin{array}{l}-\underset{¯}{\begin{array}{l}60745\\ 9786\end{array}}\\ 51069\end{array}$