Which of the following statements is not correct?

• A.When ebonite rod is rubbed with wool the ebonite rod acquires a negative charge and wool acquires a positive charge
• B.When a glass rod is rubbed with silk the glass rod acquires a positive charge while silk acquires a negative charge
• C.When fur is rubbed with ebonite rod the ebonite rod acquires a positive charge and fur a negative charge
• D.When wool rubbed with an ebonite rod is brought near silk rubbed with a glass rod attraction occurs.