The 'Housing for All' scheme faces the following key constraints: Which are correctly matched? 1. Lack of access to finance from formal financial institutions. 2. Long-drawn out, multi-level approval system in urban areas in a large majority of municipal jurisdictions. 3. For several categories of houses or those in particular locations, these delays are common even where a single window system has reportedly been introduced 4. Limited private sector participation in affordable housing schemes in urban areas.

Answer: Option A