The Service Area Approach was implemented under the purview of

The correct answer is Lead Bank Scheme.

Step-by-Step Explanation:

1. Understanding the Service Area Approach (SAA):
The Service Area Approach (SAA) was introduced in 1989 as a strategic methodology for rural credit delivery. Under this approach, each commercial bank branch in a rural or semi-urban area was designated a specific cluster of villages (typically 15 to 25 villages) as its "service area." The designated branch was responsible for assessing the credit needs of those villages and planning rural development activities accordingly.

2. Association with the Lead Bank Scheme (LBS):
The Lead Bank Scheme was introduced by the Reserve Bank of India (RBI) in 1969 to ensure adequate banking facilities in rural areas, where a specific bank was assigned as the "lead bank" for a designated district. The Service Area Approach was implemented as a sub-component or an extension under the purview of the Lead Bank Scheme to streamline micro-level economic planning and targeted credit allocation at the village cluster level.

3. Conclusion:
Therefore, the Service Area Approach was implemented under the purview of the Lead Bank Scheme.