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The distinguishing feature of High-level Data Link Control (HDLC) compared to its predecessor is that it adds error correction and flow control. HDLC is a synchronous data link layer protocol that incorporates mechanisms to ensure reliable communication. This includes the ability to detect errors through checksums and correct them, as well as manage the rate of data transmission between devices, which helps prevent data loss during transmission.

The significance of error correction and flow control lies in enhancing the reliability and efficiency of data transmission over various types of networks. These additions allow for more robust connections compared to earlier protocols, making HDLC more suitable for use in environments where transmission errors are likely or where devices may have varying processing speeds.

In contrast to the other options, the focus on cloud technology integration is not a distinguishing feature of HDLC, as it predates the widespread use of cloud computing. The specification of operating solely on fiber optics is inaccurate, as HDLC can operate over various physical media, not limited to fiber. Lastly, HDLC is not restricted to carrying only voice data; it is versatile enough to transport various types of data packets, making it applicable in multiple networking scenarios.