The question asks for the full form of the abbreviation "DTS." Based on the context provided, this falls under General Awareness, related to physics and possibly technology concerning audio systems.

Let's consider the given options:

1. Digital Transmission Systems Format for Video - This option includes "Transmission Systems," which is commonly used in communication technologies, not specifically for audio or theatre systems.
2. Digital Theatre Systems Format for Video - This option relates to "Theatre Systems" for video, which isn't accurate since "DTS" commonly refers to audio formats.
3. Digital Theatre Systems Format for Audio - DTS is widely known in audio technology, often used in surround sound systems and known for its use in audio formats. This is the correct answer.
4. Direct Transmission for Satellite Services - This option is unrelated to the context of audio systems or theatre, focusing more on satellite communication.

Thus, the correct answer is that DTS stands for Digital Theatre Systems Format for Audio. This is because DTS is a standard that refers specifically to a type of audio encoding system widely used in film and music for creating high-quality, immersive sound experiences.

This explanation is supported by the widespread application and recognition of DTS technology in the audio field, especially in cinema and home theatre systems.