Regional and Historical Context: The term "Pahi-Kashta" was used in the specific historical and regional context of the seventeenth century, particularly in certain regions of the Indian subcontinent.

Distinctive Terminology: "Pahi-Kashta" was a distinctive term used to categorize this specific group of non-resident cultivators, distinguishing them from other categories of agricultural laborers and landholders.

Contractual Nature: The term highlighted the contractual nature of their agricultural activities. These cultivators did not reside in the village where they worked but had contractual agreements to cultivate the land in exchange for a share of the produce or a fixed payment.

Role in Agriculture: "Pahi-Kashta" played a significant role in agricultural practices and land utilization during that period, making it important to have a specific term to identify this group.

So, the correct option is [4].