Which of the following matrices is/are diagonalizable on \(\mathbb{R}\)?
1
\(A = \left[ {\begin{array}{*{20}{c}} 1&1\\ 0&0 \end{array}} \right]\)
2
\(A = \left[ {\begin{array}{*{20}{c}} 2&0&0\\ 2&6&0\\ 3&2&1 \end{array}} \right]\)
3
\(A = \left[ {\begin{array}{*{20}{c}} 1&1\\ 1&1 \end{array}} \right]\)
4
\(A = \left[ {\begin{array}{*{20}{c}} 0&1\\ { - 1}&0 \end{array}} \right]\)