6. 已知 \(A = [a_{ij}]_{2 \times 2}\),其中 \(a_{ij} = |i - 2j|\),若 \(A^2 = [c_{ij}]_{2 \times 2}\),則 \(c_{11} + c_{22}\) 之值為何?(A)2(B)3(C)4(D)5