Consider the following infrastructure sectors: 1. Affordable housing 2. Mass rapid transport 3. Health care 4. Renewable energy On how many of the above does UNOPS Sustainable Investments in Infrastructure and Innovation (S3i) initiative focus for its investments?

1. The United Nations Office for Project Services (UNOPS) launched the Sustainable Investments in Infrastructure and Innovation (S3i) initiative to support large-scale investments in key infrastructure sectors aligned with Sustainable Development Goals (SDGs). 2. The primary focus areas explicitly mentioned for S3i investments include: Affordable Housing, Renewable Energy, and Health (Health care infrastructure). 3. While Mass Rapid Transport is a crucial infrastructure sector and contributes to sustainability, it is not always listed as one of the primary, distinct target sectors for the S3i initiative compared to the other three. 4. Therefore, UNOPS S3i focuses on three of the listed sectors: Affordable housing, Health care, and Renewable energy.