Which sentence correctly demonstrates the use of commas in a series?

Question 1 options:

Sarah wants a pink unicorn cake, purple rainbow balloons, and frosted sugar cookies at her party.


Sarah wants a pink unicorn cake, purple rainbow balloons and, frosted sugar cookies at her party.


Sarah wants, a pink unicorn cake, purple rainbow balloons, and frosted sugar cookies, at her party.


Sarah, wants a pink unicorn cake purple rainbow balloons and, frosted sugar cookies at her party.