ICDS Scheme, also known as Integrated Child Development Services Scheme, is a flagship program of the Government of India aimed at improving the overall development of children in the country. It focuses on providing a package of services that includes school education, nutrition support, and immunization.

1. School Education:
Under the ICDS Scheme, efforts are made to provide early childhood care and education to children in the age group of 3-6 years. This includes the establishment of Anganwadi centers, where children can receive pre-school education in a safe and stimulating environment. The aim is to promote the holistic development of children and prepare them for formal schooling. The ICDS Scheme also focuses on providing non-formal education to children who are out of school or dropouts.

2. Nutrition Support:
Nutrition support is a key component of the ICDS Scheme. It aims to address the issue of malnutrition among children in the country. The scheme provides supplementary nutrition to children in the age group of 6 months to 6 years, pregnant women, and lactating mothers. This includes the provision of hot cooked meals, take-home rations, and other nutrition supplements. The goal is to ensure that children receive adequate nutrition for their physical and cognitive development.

3. Immunization:
Immunization is another important aspect of the ICDS Scheme. It aims to protect children from vaccine-preventable diseases and reduce child mortality. The scheme focuses on providing immunization services to children in the age group of 0-6 years. This includes the provision of vaccines for diseases such as polio, measles, diphtheria, pertussis, tetanus, and hepatitis B. The ICDS Scheme works in coordination with the Universal Immunization Program to ensure that children receive timely and complete immunization.

In conclusion, the Integrated Child Development Services Scheme aims to provide multiple services to children, including school education, nutrition support, and immunization. These services are essential for the overall development and well-being of children, and the ICDS Scheme plays a crucial role in ensuring their implementation. Hence, the correct answer is option 'C' – 2 and 3 only.