What frequency range is utilized for upstream communications in DOCSIS?

The frequency range utilized for upstream communications in DOCSIS (Data Over Cable Service Interface Specification) is accurate as it typically operates in the range of 5 MHz to 42 MHz. This range is specifically designed for transmitting data from a cable modem back to the cable operator's headend. Upstream channels usually have lower frequency limits compared to downstream, which is why this range is on the lower end of the spectrum.

In contrast, the other options represent frequency ranges that either pertain to downstream communications or other types of communications entirely. For example, downstream data transmission occurs in much higher frequency ranges, such as 50 MHz to 860 MHz, which is necessary to accommodate the high data rates required by both cable television and broadband services. The ranges of 100 MHz to 1 GHz and 1 KHz to 5 KHz are also not applicable, as they do not correspond to upstream DOCSIS communication requirements. Therefore, the specified range of 5 MHz to 42 MHz as the correct answer aligns perfectly with the technical standards established for upstream communication in DOCSIS.