Which of the following actions by darius strengthened the persian empire by encouraging trade select all that apply (2 answers)

a) encouraged use of coins
b) set up express mail delivery
c)set up common weights and measures
d) expanded the barter economy

um hi i’m new here but i have an opinion i guess. i think we are but when i say war i don’t mean fighting i mean political rallies differing opinions and cultures and ideas and they all clash so hard. not all wars are fought on a battlefield. most are fought in our minds and minds of others. somethings gonna have to change and i honestly think a ‘war’ is the best way to do it. fight it out. stand up for what you believe. it’ll work out. freakin united states of america we’ve got this.