What is the relationship between 'Banana Republic' and 'Art Peck' in the context of the input sentence.
Options: legal form, employer, chairperson, chief executive officer

For his part, Gap CEO Art Peck said on the company's most recent earnings call that the Banana Republic and Gap brands will tap into Old Navy's learnings moving forward, so they too can speed up product delivery and create a consistent fit.
chief executive officer