The correct option is "1 and 2 only." Stealth technology aims to minimize an object's radar cross-section through the use of Radar Absorbing Materials (RAM), making it difficult for radar systems to detect them. While it is true that specific frequencies can be utilized to detect stealth objects, especially at ranges or through advanced radar systems, the use of metamaterials to increase scattering of electromagnetic radiation is misleading since secular stealth design avoids rather than enhances scattering. This understanding of stealth technology aligns with principles covered in defense studies and military technology sections in standard UPSC-level materials.