Are all the sentences OK?

Could somebody please help. Thanks.

The first two are okay, but this one is not.

"take care of" is a phrase which hangs together, so you don't need a second "of".

I agree. It's a phrasal verb: http://www.oneworldofenglish.com/english_phrasal_verbs/phrasal_verbs_T/take_care_of.htm

is marginally acceptable. I can imagine it being used in registers such as high rhetoric, poetry or song lyrics, but it's not standard usage.