How do you declare a two-dimensional array in JavaScript?

let arr = [[]];
let arr = [][[]];
let arr = [[], []];
let arr = [[],] [[]];

In JavaScript, a two-dimensional array is declared by creating an array where each element is another array. This creates a matrix-like structure. For example, let arr = [[], []]; declares a 2x2 two-dimensional array. The other options contain syntax errors or do not create a valid two-dimensional array.

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