Low temperatures (Cryogenics) find application in

Cryogenic technology is central to modern space propulsion because many high‑performance rocket propellants (liquid hydrogen/oxygen) must be stored and handled at very low temperatures, improving thrust and efficiency. Cryogenic cooling is also essential for achieving superconductivity in magnets and coils, enabling strong stable magnetic fields used in magnetic‑levitation systems and related superconducting applications [1]. In medicine, cryosurgery employs extreme cold to ablate abnormal tissues, representing a direct clinical application of low‑temperature techniques (cryogenics). Telemetry (data transmission/remote sensing) is not a primary use of cryogenic cooling. Together, space travel, surgical cryoablation and superconducting magnetic levitation are established application domains of cryogenics, matching option 1.