Decide which of the following sentences is properly punctuated. Lee's favorite classes - art history, drawing II, and oil painting I - were crammed with ambitious, hard-working students?
1) Lee's favorite classes - art history, drawing II, and oil painting I - were crammed with ambitious, hard-working students.
2) Lee's favorite classes, art history, drawing II, and oil painting I, were crammed with ambitious, hard-working students.
3) Lee's favorite classes: art history, drawing II, and oil painting I were crammed with ambitious, hard-working students.
4) Lee's favorite classes; art history, drawing II, and oil painting I were crammed with ambitious, hard-working students.