Consider the following statements about static versus dynamic aspects of India's physical geography:

I. The basic physiographic divisions (Himalayas, Plains, Plateau) are relatively static features over human timescales.

II. Processes like erosion, deposition, and tectonic movements continue to modify the landscape dynamically.

III. River channels in the Indo-Gangetic plains are dynamic, changing course over time.

IV. Coastlines are dynamic, experiencing erosion and accretion due to waves, currents, and sea-level change.

Which of the statements given above are correct?