enters any part of any premises of the Corporation, requiring permission for entry thereto, without the permission of an employee of the Corporation in charge;
(b)
enters a fenced enclosure, building or room belonging to the Corporation in contravention of any regulation, rule or notice not to do so;
(c)
refuses to quit any fenced enclosure, building or room belonging to the Corporation on being requested to do so by any employee of the Corporation; or
(d)
intentionally obstructs or incites anyone to obstruct or impedes any employee of the Corporation in the performance of his duties under this Act,