Which of the following is NOT a type of video connector?

The correct answer identifies "Optical" as not being a type of video connector, which is accurate because optical connections generally refer to audio formats, specifically fiber optic cables that transmit audio signals rather than video signals.

In contrast, HDMI (High-Definition Multimedia Interface) is a widely used digital interface that transmits both video and audio signals, making it a standard for modern video connections. Composite video, meanwhile, is an older analog connection method that combines video information into a single signal; it carries standard definition video but does not carry audio. The 3.5 mm connector, typically used for audio, is also related to video in the context of specific applications, such as a combination audio/video jack found on some devices, but it primarily serves audio purposes.

Thus, while HDMI, composite, and the 3.5 mm connector can be associated with video, optical connections do not fulfill the same role, which is why it is the correct answer to the question.