The correct answer is A because the SDC OS is designed with open northbound interconnection capability for platform integration. The material explains that "Standard interfaces such as ONVIF are used to connect cameras to the IVS platform" and further states that the open SDC OS supports camera connection through northbound access protocols such as "ONVIF, GB/T 28181, and GA/T 1400" This directly confirms option A .
In practical intelligent vision deployment, these protocols are essential for interoperability between cameras, platforms, and third-party systems. ONVIF is widely used for standardized video surveillance interoperability. GB/T 28181 is important in many public-security and video networking scenarios. GA/T
1400 is commonly associated with structured data and public-security video information exchange. The other options list either general IT service protocols or physical interfaces, which are not the defined northbound camera access protocols in this context. Therefore, A is the correct answer because it precisely matches the supported protocol set described in the HCIP Intelligent Vision material.