The correct answer is B because the 1 + N function is designed to extend intelligent analysis capability to existing non-intelligent cameras without replacing them. This is one of Huawei’s practical upgrade approaches for legacy surveillance systems. The material states that “With the proprietary 1 + N technology, a single intelligent camera can connect to N generic cameras on a live network, request streams from these cameras, and perform intelligent analysis on the streams”

This directly matches option B .

From a solution-design standpoint, this function is highly valuable in reconstruction projects where the existing camera network is still usable but lacks intelligent features such as target capture or vehicle recognition. Instead of replacing all cameras, one intelligent camera can act as the analysis point for several generic cameras, reducing upgrade cost and deployment complexity. Option A is wrong because the function is not for storage expansion. Option C incorrectly changes the relationship into intelligent-camera-to-PTZ cooperation. Option D is also wrong because the whole purpose of 1 + N is to analyze additional external streams, not just the local one. Therefore, B is the correct answer.