What Is Now Considered to Be the Mechanism for the Production

What is now considered to be the mechanism for the production of the double lobes of radio emission that appear on either side of many galaxies?

A) radio emission from the two halves of galactic halos containing many globular clusters that generate radio noise
B) the supernova explosion of a massive star and ejection outward in two opposite directions of very hot gas that emits thermal energy
C) two oppositely directed jets of relativistic particles spiraling around magnetic fields
D) material streaming in toward a black hole, perpendicular to and on opposite sides of the accretion disk