Which sentence is punctuated correctly?

Question

(1 point)
Responses

Both of the cat’s collars have little bells on them.
Both of the cat’s collars have little bells on them.

Both of the cats’ collars have little bells on them.
Both of the cats’ collars have little bells on them.

Both of the cats’s collars have little bells on them.
Both of the cats’s collars have little bells on them.

Both of the cats collars have little bells on them.

Answer 1

Both of the cats’ collars have little bells on them.