Answer:
John charges the rod through friction, then charges the electroscope through conduction.
Step-by-step explanation:
When John rubs a piece of cotton fabric on a plastic rod , charge is produced when dislocation of some electron takes place through the process of friction .
When he touches the rod to the electroscope, charge is transferred to electroscope through the process of conduction . Induction involves transfer of charge without touching . In this case charge transfer takes place through conduction .