Justification: Cycle in RAG implies deadlock only with single instance per resource type. With multiple instances, a cycle may not imply deadlock because another instance may satisfy request and break cycle. Example: 2 instances of R1, P1 holds R1, P2 holds R1, each requests other — cycle exists but resources can be allocated to break it. Deadlock requires cycle + each resource in cycle has only one instance (or unsatisfiable request). Hence cycle is necessary but not sufficient for multiple instances.