Square matrices of the type `[(x,x),(x,x)]` form a group under the usual matrix multiplication. The identity of this group is

Options

A. `[(1,0),(0,1)]`
B. `[(1,1),(1,1)]`
C. `[(1//2, 1//2), (1//2, 1//2)]`
D. `[(1//3, 1//3),(1//3, 1//3)]`

Answer

C