1. CSO stands for Central Statistical Organization. It is responsible for coordination of statistical activities in the country and evolving and maintaining statistical standards. The activities of CSO includes conduct of annual survey of Industries, Economic census, Consumer price indices for Urban non-manual employees, Human Development Statistics in states and union territories, etc.
2. In terms of poverty reduction, among all the South East Asian countries, China showed a remarkable success.
3. Among all the options given in the third part of your question, it is the option (c) i.e. 'unemployed' cannot be strictly categorised under urban poor. The unemployed can be classified both under rural and urban poor.