Which of the following matrices is Hermitian as well as unitary?
1
\( \left(\begin{array}{cc} 0 & -i \\ i & 0 \end{array}\right)\)
2
\( \left(\begin{array}{ll} 0 & i \\ i & 0 \end{array}\right)\)
3
\( \left(\begin{array}{cc} 1 & -i \\ i & 1 \end{array}\right)\)
4
\( \left(\begin{array}{cc} 0 & 1+i \\ 1-i & 0 \end{array}\right) \)