In a long-distance RF link, what statement about Fade Margin is true?

Fade Margin is an additional pad of signal strength designed into the RF system to compensate for

unpredictable signal fading. It is the difference between the receiver’s sensitivity and the actual

received signal level. A higher Fade Margin indicates a more robust link that can withstand

interference, attenuation, or other factors that may reduce the signal strength. A lower Fade Margin

means that the link is more susceptible to failure or performance degradation. Fade Margin is usually

expressed in decibels (dB) and can be calculated by subtracting the receiver sensitivity from the

received signal level. Reference: 1, Chapter 2, page 51; 2, Section 2.1