Answer:
The answer to your question is number 3.
Step-by-step explanation:
Copper has two valences, + 1 and +2, so when it forms a compound, we have to write the valence with which it is working.
1) This name is incorrect because it is not naming the valence of copper.
2) This name is incorrect because the ending of hypochloride.
3) This is the correct name of the compound because it considers both the valence of copper and the ending of hypochlorite.
4.- This name is wrong because it does not consider the valence of copper.