The term "Summary Settlement" was used to describe the initial British revenue settlement imposed in Awadh (Oudh) after its annexation. This settlement was a brief and summary assessment of revenue collection and land revenue policies. It involved a simplified assessment of land revenues, often based on existing data and records, and aimed at quickly establishing revenue collection systems in the newly acquired territory.

The use of the term "Summary Settlement" reflects the swift and often rudimentary approach taken by the British authorities in the immediate aftermath of annexation. Later, more comprehensive revenue settlements and policies were introduced to manage revenue collection and land administration in the region.

So, the correct option is [3].