Covariance matrix

Why (1) is selected?

Course Name: Quantitative Portfolio Management, Section No: 3, Unit No: 14, Unit type: Quiz

Hi,
One of the well-known properties of a covariance matrix is that it is symmetric. This means the matrix is equal to its own transpose. That’s what we were testing with this quiz question. Among the given options, only the first matrix satisfies this symmetry property