The compound shown is treated with a peroxyacid (m-CPBA). Which structure is the main product?

The compound is cyclohexanone. In the Baeyer-Villiger oxidation an oxygen atom is inserted between the carbonyl carbon and the neighbouring carbon, expanding the ring to the seven-membered lactone, epsilon-caprolactone. The alpha-hydroxyketone, diacid and alcohol are not products of this reaction.