Answer: (c)

Explanation:
Stealth technology is designed to minimize detection by radar and other sensing systems.

Statement 1 is correct. Stealth objects are designed with a very low radar cross-section (RCS) and often use Radar Absorbing Materials (RAM) and special shaping to reduce reflected radar signals.

Statement 2 is correct. Stealth is frequency-dependent. Aircraft and other objects may be harder to detect at certain radar frequencies but can be detected at others (e.g., low-frequency radars can sometimes detect stealth aircraft due to wavelength effects).

Statement 3 is incorrect. Metamaterials used in stealth applications are designed to control, redirect, or reduce scattering of electromagnetic waves, not to increase scattering. Increasing scattering would make an object more detectable, which is opposite of stealth objectives.