Explanation:

Only statement 1st is correct.

• Recently, the RBI joined Project Nexus, an initiative to enable instant cross-border retail payments by linking domestic Fast Payment Systems.

About Project Nexus

• It is a multilateral international initiative to enable instant cross-border retail payments by interlinking domestic Fast Payments Systems (FPSs).

• Rather than requiring FPS operators to establish multiple custom connections for each country, Nexus provides a standardized, single-connection solution that enables seamless transactions across borders.

• With Nexus, an FPS operator can connect to a single network, enabling instant access to other countries within the network. 

• It was conceptualized by the Innovation Hub of the Bank for International Settlements (BIS).

• It aims to connect the FPSs of four ASEAN countries (Malaysia, Philippines, Singapore, and Thailand); and India, who would be the founding members and first mover countries of this platform.

• The platform, which can be extended to more countries, is expected to go live by 2026. 

Hence option 1st is correct.