Can someone please help me understand how to solve this matrix operation? I am having trouble understanding this

Regarding the mix column operation of the AES round function, it is performed with a pre-defined matrix, i.e., 12 3 1 1 1 2 3 1 1 1 2 3 L3 1 1 2 Explain why this mix column operation can be implemented with a simple look up table and XOR (4 marks). Regarding the mix column operation of the AES round function, it is performed with a pre-defined matrix, i.e., 12 3 1 1 1 2 3 1 1 1 2 3 L3 1 1 2 Explain why this mix column operation can be implemented with a simple look up table and XOR (4 marks)