답이 틀렸음. C가 답이다.
https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Array/flat
Array.prototype.flat() - JavaScript | MDN
flat() 메서드는 모든 하위 배열 요소를 지정한 깊이까지 재귀적으로 이어붙인 새로운 배열을 생성합니다.
developer.mozilla.org
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(9/60) myArraym can have one level, two levels, or more levels.Which statement flattens myArray when it can be arbitrarily nested?
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