Which answer is correct?

Use `[[0] * 3] * 3`. This creates a 3x3 grid of zeros.

— concise_py

Use a list comprehension: `[[0] * 3 for _ in range(3)]`. Each row is an independent list.

— comp_fan

Use `numpy.zeros((3, 3))` if you have NumPy installed. Purpose-built for numerical arrays.

— numpy_dev

Use nested loops: ``` grid = [] for i in range(3): grid.append([0] * 3) ```

— verbose_py