02.24: Two small hollow metal spheres hung on
qzi)pp 0 6ana( insulating threads attract one another as shown. It is know
n6a)p(p0iqaz n that a positively charged 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?