The commas are used correctly in the sentence because the underlined element is

If your sentence is "Michael Jordan, the basketball player, won six championships for the Chicago Bulls," then the correct answer is a nonrestrictive phrase.
First of all, the underlined element cannot be a clause because there is no verb there, meaning that it has to be a phrase. Second of all, it cannot be restrictive because its meaning is not essential in this sentence - if you omitted this phrase, the sentence would still keep its meaning because everybody knows who Michael Jordan is. Thus, the correct answer is a nonrestrictive phrase.

The best answer in my opinion would be the last one. i hope this