Which argument did President Lincoln use to oppose the secession of the Southern States in his first Inaugural Address?

(pick an answer)

As President, he had to defend the nation against foreign invasions

Slavery was not profitable as the South believed

Southern states did not permit their people to vote on secession

The government was a union of the people as a whole and not of the states

The government was a union of the people as a whole and not of the states