Which generalization is supported by this quotation?
1) Korematsu was excluded from the military area because of hostility towards him or his race.
2) Korematsu was excluded from the military area because of the fear of invasion by the Japanese Empire.
3) Korematsu was excluded from the military area because of security measures taken during war.
4) Korematsu was excluded from the military area because of the authorities' concern about the West Coast.