By the end of act 1 of The Tragedy of Julius Caesar, what do we know about the soothsayer’s omen, “Beware the Ides of March”?

It means there will be another storm on March 15.
It means that Caesar and the Senate will vote on new senators on March 15.
Caesar is in danger on the Ides of March, especially in light of Cassius’ plot against him. It means Caesar’s life is in danger on that day.
Cassius is in danger on the Ides of March, especially in light of the soothsayer’s plot to warn Caesar and motivate him to murder Cassius instead.