Which two components are Cisco video-surveillance storage techniques? (Choose two.)

NAS is a storage architecture and device category, not a storage technique - it describes where data resides on the network rather than how the underlying storage medium is structured or implemented.

SAN (Storage Area Network) is a high-speed block-level storage topology, not a video surveillance storage technique - it describes a storage network architecture rather than a recording medium or method.

RAID (Redundant Array of Independent Disks) is a foundational storage technique in Cisco video surveillance that provides data redundancy and improved throughput, ensuring continuous recording remains available even if an individual disk fails.

SD cards are consumer-grade removable flash media not recognized as a defined Cisco video surveillance storage technique in enterprise-grade deployments and architectures.

Flash storage is used in Cisco video surveillance systems - particularly in edge devices and IP cameras - for local buffering and short-term clip retention due to its durability, low latency, and resistance to shock and vibration.