What do the phrases, "the die is cast" and "crossing the Rubicon" mean?

In terms of territory won in the french and indian war, which of the following is a true statement? a. england won the most territory as a result of the war. b. france won the most territory as a result of the war. c. spain won the most territory as a result of the war. d. england, france, and spain all won an equal amount of territory as a result of the war.