At the Value Stream Level, SAFe identifies three primary roles responsible for execution:
Solution Management (A): Owns solution intent and prioritization.
Value Stream Engineer (B): Chief Scrum Master and facilitator for the Value Stream (similar to RTE at the ART level).
Solution Architect/Engineer (C): Provides architectural vision and technical guidance.
While customers and release management are important, they are not listed as the primary responsible roles at this level.
"Solution Management, Value Stream Engineer, and Solution Architect/Engineer are the key roles at the Value Stream level ensuring successful execution." (Source: SAFe 6.0 Framework: Value Stream Roles; SPC 6.0 Guide "Enhancing the Portfolio")