(53/60) Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers

var var1 = 0;
var var2 = 1;

console.log(var1 + var2);
console.log(var1.toString() + var2.toString());
console.log(String(var1).concat(var2));
console.log(String.concat(var1 + var2));  // error

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