Which of the following are correct?

The correct options are
C Sodium Perchlorate - $NaCl{O}_4$
D Sodium Chlorate - $NaCl{O}_3$
If a compound contains two elements and oxygen following rules are followed:
Name of compound = First element name + second element name + Suffix
In case of prefix, it is added before second element name.

1. Prefix ‘hypo’ is used if number of oxygen < 2
2. Suffix ‘ite’ is used if number of oxygen atom = 2
3. Suffix ‘ate’ is used if number of oxygen atom = 3
4. Prefix ‘per’ is used if number of oxygen atom > 3

The correct naming of the given compounds are:
$SodiumChlorite-NaCl{O}_2$ $SodiumHypochlorite-NaClO$ $SodiumPerchlorate-NaCl{O}_4$ $SodiumChlorate-NaCl{O}_3$