E6D09:What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E6D09 is Ferrite beads.
The key fact is Ferrite beads. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.