Consider the following two sets of equations :
I. 2x - y = 0 and 6x - 3y = 0
II. 3x - 4y = 0 and 12x - 20y = 0
A. both sets I and II possess unique solutions.
B. Set I possesses unique solution and set II has infinitely many solutions.
C. Set II possesses unique solution and set I possesses infinitely many solutions.
D. None of the sets I and II possesses a unique solution.