Read the excerpt below and answer the question.

CHORUS. Learned Faustus,
To know the secrets of astronomy,
Graven in the book of Jove’s high firmament,
Did mount himself to scale Olympus’ top,
Being seated in a Chariot bright,
Drawn by the strength of yoky dragons’ necks.
What does the word yoky most likely mean?

beasts connected by a crosspiece in order to pull something
yellow like an egg yolk
conjured by the dark arts
beasts that are powerful in the yokes of their necks