28. The value of 'x' and 'y in the parallelogram ABCD, Where diagonals intersec
at 'O',OA = x - y,
OB = 15, OC = 8 and OD = y-6.
A) x = 17, y = 9
B) x = 29, y = 21
C) x = 9, y = 21
D) x = 21, y = 17
