The correct answer is option 4, which includes all the given options: 1, 2, 3, and 4.

Option 1 states that non-military Confidence Building Measures (CBMs) in a peace process include people-to-people contact across borders. This means that individuals from different countries or regions engage in direct communication and interaction, which can help build trust and understanding.

Option 2 states that literary and cultural interaction under governmental and non-governmental agencies is also a non-military CBM. This refers to activities such as literary exchanges, cultural events, and collaborations between different societies, which can promote dialogue and mutual appreciation.

Option 3 mentions an increase in travel facilities as another non-military CBM. This means that easing travel restrictions and improving transportation infrastructure can enhance people`s mobility, facilitate exchanges, and foster connections between different communities.

Option 4 states that joint initiatives to tackle common socio-economic problems are also included in non-military CBMs. This means that countries or regions can work together to address shared challenges such as poverty, inequality, and environmental issues, which can help build cooperation and trust.

In summary, all the options provided are correct and contribute to non-military CBMs in a peace process.