Explanation: To correctly reconstruct a one-way facsimile (FAX) transmission, the receiving station must precisely synchronize with the sending station. * **Index of Cooperation (IOC)** is a critical parameter that defines the relationship between the image's scanning line length and the total number of lines. It ensures the correct aspect ratio of the received image. If the IOC is set incorrectly, circles may appear as ovals, and the image will be distorted horizontally. * **Revolutions Per Minute (RPM)** specifies the speed at which the transmitting station's scanner drum rotates (or the effective line scan rate). The receiving station must match this RPM to ensure the correct vertical scaling and to prevent the image from being stretched, compressed, or skewed vertically. Options A, B, and C describe modulation characteristics or derived parameters rather than fundamental user-set synchronization parameters for analog FAX reception. Lines-per-inch (LPI) is an output characteristic related to IOC, while frequency shift (FS) and black-mode signal (BMS) relate to the FSK modulation itself, not the image synchronization required for proper display.