"Bandwidth is defined as the maximum rate of data transfer for a given network path, typically measured in bits per second (bps)."
- Axis Communications Academy, Network Video Fundamentals, 2022
"Bandwidth refers to the network's capacity to carry data, not the amount of data produced or stored."
- Axis Web Article: Understanding Bandwidth
References:
Axis Communications Academy, Network Video Fundamentals, 2022 (p. 49)
Axis Web Article: Understanding Bandwidth

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Fixed box cameras typically use a CS-mount lens, which allows for easy installation and flexibility in changing lenses to meet different surveillance needs. The CS-mount standard is widely used in the security industry and provides compatibility with a variety of lens types. Axis Communications' fixed box cameras often feature CS-mount lenses, as detailed in their product specifications and installation guides.

"The interval between two I-frames (intra-coded frames) in a compressed video stream is called the Group of Pictures (GOP). The GOP defines how many frames are between full image frames and is a key concept in video compression."
- Axis Communications Academy, Network Video Fundamentals, 2022
"A GOP (Group of Pictures) consists of one I-frame followed by a series of P-frames and B-frames, until the next I-frame appears."
- Axis Web Article: Video Compression
References:
Axis Communications Academy, Network Video Fundamentals, 2022 (p. 58)
Axis Web Article: Video Compression

The primary purpose of a router is to forward traffic between different networks, such as between a local network and the internet. This is essential for directing data packets to their correct destinations across diverse networks. Therefore, the correct answer is B. For more detailed information, refer to Axis Communications' documentation on networking fundamentals and router functions.