Final answer:
The HFC return path design is sensitive to noise because of higher frequency modulation, which leads to short-wavelength, high-frequency signals that carry higher energy photons, resulting in greater susceptibility to interference. Option D is correct.
Step-by-step explanation:
The aspect that makes the HFC (Hybrid Fiber-Coaxial) return path design particularly sensitive to ingress and noise is d) Higher frequency modulation. High-frequency signals are more susceptible to interference and ingress noise because they have short-wavelength and high-frequency characteristics.
These signals are at the short-wavelength and high-frequency region of the spectrum, where EM radiation photons carry more energy. This energy has a greater ability to disrupt materials through phenomena such as the photoelectric effect. Therefore, precision in HFC return path design is crucial to mitigate the effects of noise and maintain signal integrity.
The aspect that makes the HFC return path design particularly sensitive to ingress and noise is high frequency modulation (d).
High-frequency EM radiation photons carry more energy and therefore have a greater ability to disrupt materials through the photoelectric effect. In the HFC return path design, higher frequency modulation can lead to increased interference from ingress and noise, making it more sensitive to disruptions.