How did darius first approach the greeks to gain their lands

Darius commissioned monumental stone reliefs at strategic sites, which advertised his accomplishments. At Bisitun, east of Kermanshah, on the Great Khorasan Road, a stone relief was carved to commemorate the victory that saw his ascension to the throne. Inscriptions also were engraved proclaiming how Darius defeated his enemies and seized the crown.

He was the first ruler in history to mint coinage that depicted his own image. It was a brilliant stroke; not only did it make commerce easier, as well as the payment of tribute, it also served as a means of effective propaganda. Even in a far-flung territory, a gold or silver coin of the realm served as a reminder of fealty to King Darius. His image was struck as a warrior with a drawn bow and quiver or spear emphasising both their submission to a powerful leader and the wealth his rule had brought. Darius was no shopkeeper.

I’m pretty sure that the answer is b.