Perform the indicated operations in each case:
A) In C*, calculate the product (7 + 5i) (-3 + 2i) .
B) In GL(2, ℤ13) , find the determinant of the matrix [7 4; 1 5].
C) In GL(2, ℝ) , compute the inverse of the matrix [6 3; 8 2].
D) In GL(2, ℤ7) , determine the inverse of the matrix [2 1; 1 3].
Which operation results in a singular matrix?
1) A
2) B
3) C
4) D