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

RAID is a foundational storage technique in Cisco Video Surveillance Storage System appliances, providing redundancy and sustained write performance required for continuous video recording.

Flash storage is built into Cisco surveillance cameras and encoders to provide local on-device buffering and recording without dependence on network-attached storage infrastructure.

SD cards are consumer-grade removable media and are not recognized as a primary Cisco video surveillance storage technique in Cisco's VSS product line.

SAN is a general enterprise storage-networking architecture and is not classified as a specific Cisco video surveillance storage technique.

NAS is a network-attached file-sharing approach and, like SAN, is not designated as one of the primary Cisco video surveillance storage techniques.