Explanation: Digital signal processing (DSP) offers significant advantages in RADAR systems, particularly for weak signal detection. DSP allows for sophisticated algorithms to be applied to the received signal, such as matched filtering, pulse compression, and coherent integration. These techniques effectively extract very weak target echoes from background noise and clutter, significantly improving the signal-to-noise ratio. This enhances the ability to detect distant or small targets that would otherwise be lost in analog systems. A) Improved display graphics are a function of digital display technology, not the primary benefit of DSP for *signal processing* itself. C) RADAR and SONAR operate on fundamentally different principles and media (radio waves vs. sound waves). DSP in RADAR does not directly affect interference with SONAR. D) Interference with other radio communications is primarily managed through careful frequency allocation, transmitter design, and filtering, not inherently by DSP on the received signal.