With reference to the decline of the Gupta Empire and the process of regionalisation in Early Medieval India, consider the following statements:

I. The weakening of imperial authority facilitated the emergence of territorially consolidated regional polities.

II. The increasing prevalence of land grants contributed to the diffusion of fiscal and administrative authority.

III. The transition led to the disappearance of urban centres as political and economic nodes.

Which of the statements given above are correct?