National Education Policy (NEP) 2020 emphasizes on transforming assessment by :

The correct option is incorporating self-assessment and peer-assessment.

Step-by-step Explanation:

1. The National Education Policy (NEP) 2020 aims to shift the assessment culture in schools from a traditional, summative model focused purely on rote learning towards a formative, continuous, and holistic model.

2. A key recommendation of NEP 2020 is to encourage student-centric assessment practices, which explicitly include self-assessment and peer-assessment. This allows learners to reflect on their own progress, recognize areas for improvement, and build critical thinking skills by assessing their peers.

3. Let's analyze why the other options are incorrect:
- Devaluing socio-cultural context of students: NEP 2020 emphasizes valuing and integrating the diverse socio-cultural contexts of learners, not devaluing them.
- Executing summative form of assessment: NEP 2020 proposes shifting away from high-stakes summative exams toward continuous formative assessments.
- Practicing unitary notion of intelligence: NEP 2020 supports multiple intelligences and holistic development, opposing a single or unitary notion of intelligence.

Hence, the policy strongly emphasizes incorporating self-assessment and peer-assessment to make learning a reflexive and continuous process.