Which of the following forms the foundation of SAFe?

Comprehensive and Detailed Explanation From Exact Extract:

In SAFe 6.0, the foundation of SAFe is explicitly described as the combination of the Lean-Agile Mindset, SAFe Core Values, and the SAFe Principles (“Mindset, Values, and Principles”). These foundational elements guide behavior and decision-making across portfolios, large solutions, ARTs, and teams.

Lean-Agile Mindset: the SAFe House of Lean (Respect for People and Culture, Flow, Innovation, Relentless Improvement) plus the Agile Manifesto values and principles.

SAFe Core Values: the cultural cornerstones that guide how SAFe is applied in practice.

SAFe Principles: the ten Lean-Agile principles that inform roles, events, and practices across SAFe.

Therefore, “Mindset, Values and Principles” is the correct choice and is how SAFe frames its foundation.