$NaH\left(s\right)+H_{2}O\left(aq\right)\to NaOH\left(aq\right)+H_2\left(g\right)$ and $8LiH+A{l}_{2}C{l}_6\to 2LiAl{H}_4+6LiCl$ . In the above reactions, $NaH$ and $LiH$  are the examples of

covalent or molecular hydrides

None of the above

ionic or saline or salt like hydrides

metallic or non-stoichiometric hydrides