Which of the following statements with regard to stealth technology is/are correct? 1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material. 2. Stealth objects can be detected using specific frequencies. 3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation. Select the answer using the code given below:

Stealth technology aims to reduce the radar cross-section (RCS) of an object so it reflects very little radar energy back to the source; this is achieved through shaping and the use of Radar Absorbing Material (RAM), so statement 1 is correct. Stealth aircraft can be detected by certain low-frequency radars (VHF/UHF band) and multistatic radars, because stealth shaping is optimised against the higher-frequency radars typically used in air defence, hence statement 2 is correct. However, metamaterials used in stealth coatings are designed to ABSORB or redirect electromagnetic radiation away from the source, NOT to increase scattering — increased scattering would defeat the stealth purpose. Statement 3 is incorrect. Hence statements 1 and 2 only are correct.