What is the primary function of a video conferencing codec?

• A. To code and decode and compress and transmit audio and video data
• B. To generate random numbers
• C. To manage user accounts
• D. To store video locally

Answer: (A)

The main idea is that a video conferencing codec handles encoding and decoding while compressing data for transmission. It converts raw audio and video into a compressed bitstream to fit real-time network bandwidth, then decodes that stream at the receiving end to recreate playback. This encoding/decoding process, along with synchronization of audio and video and basic error resilience for network issues, is what keeps a real-time call smooth. Other options describe tasks like generating random numbers, managing user accounts, or storing video locally, which are not the codec’s function.