关于javascript:选择篇002下面代码的输出是什么

const set = new Set();set.add(1);set.add("Lydia");set.add({    name: "Lydia"});for (let item of set) {    console.log(item + 2);}

A: 3, NaN, NaNB: 3, 7, NaNC: 3, Lydia2, [Object object]2D: "12", Lydia2, [Object object]2

参考答案: