Which of the following component package types have the least parasitic effects at frequencies above the HF range?

Explanation

A surface-mount part has almost no lead length, so the stray inductance in series with it and its capacitance to surrounding copper are far smaller than in leaded packages — the difference that decides behavior above HF. TO-220, axial-lead, and radial-lead parts all have leads long enough to matter at VHF and above.