02.24: Two small hollow metal spheres hung on insulating threads at
q:2 :lrcbmqqhb.c d+ 8tract one another as shown. It is known that a positively charg
: r:ccqq.m+hbdq l2 b8ed rod will attract ball A.
I. Ball A has a positive charge
II. Ball B has a negative charge
III. Ball A and Ball B have opposite charges
Which of the above can be correctly concluded about the charge on the balls?