Final answer:
The question seems to contain an error in phrasing. Identifying features of Cisco Unified Communications Solutions involves describing specific attributes such as voice and video calling, not stating true or false. Auxiliary physics terms such as refraction, wave interference, and wave-particle duality appeared in the question, among which refraction is indeed key in fiber optics.
Step-by-step explanation:
The student's question asks to identify key features of Cisco Unified Communications Solutions. However, the options provided (True/False) do not align with this type of question because identifying features typically requires enumerating or describing specific attributes, not justifying a statement's truth value. Therefore, an error seems to have occurred in the phrasing of the question. If indeed you are seeking the key features, Cisco Unified Communications includes voice and video calling, messaging, presence technology, and conferencing abilities, which all work together to provide a seamless communications platform for businesses.
The exercises and numbered statements listed appear to be from physics, referencing concepts such as refraction, wave interference, and wave-particle duality that have true or false answers. For example, statement 12: 'Refraction is useful in fiber optic cables for transmitting signals' is True. Refraction is the bending of light as it passes from one medium to another, and it is crucial in fiber optic cables which use this principle to transmit light signals over long distances with low loss.