Given 2x + 2y + z = 6 and apply the result to find the solution of the given system of equations: xy = 3, 2x + 3y + 4z = 17, y + 2z = 7. Given A = [2 0 1; 3 1 0; 2 2 4] and B = [4 1 2; 4 1 4; 5 1 4], verify that BA is:
a) Symmetric matrix
b) Skew-symmetric matrix
c) Identity matrix
d) Zero matrix