AI solution for React Quiz on BFE.dev
15. memo 2

The code outputs the following to the console:

A
B

This is because the App component is rendered initially, which includes A and B components. When the button is clicked using userEvent.click, the App component is re-rendered and the A and B components are re-rendered, but since they are both wrapped in memo, they only render if their props have changed. In this case, the count state has changed, but it is not being passed as a prop to either A or B, so they do not re-render. Therefore, the console logs from the initial render are repeated, with A followed by B.