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

depending on what kind of map for example a pltical maps works in many ways this iss how it works it shows the areas and places the democratics and the repbulcicans reside for example if   texas chooses trump for president there a republican state and if   califronia chooses hillary there a democratic state.