Syntax Trap #003

Today's questions is easy, right?!

console.log([10, 1, 3].sort());

What's the result?

1. [10, 1, 3]
2. [1, 3, 10]
3. [1, 10, 3]
4. [10, 3, 1]

Two-thirds of my teammates tripped over this riddle today :D Do you know the correct answer without trying it out in the console?