What was the objective of the anaconda plan?

a. to win a series of victories in the west and then "snake" across the mississippi river to take control of southern states in the east
b. to burn confederate land and cripple the agricultural production of the south
c. to lead a march of destruction through southern cities, undermining the region's industrial base
d. to seize the mississippi river and the gulf of mexico to cut off important shipping routes of the south