Please answer the following question with explanation

From the code below, select a pair of events where one occurs completely within the duration of the other.

LocalDateTime time1 LocalDateTime.of(2019, 2, 27, 8, 0); LocalDateTime time2 Local DateTimeof(2019, 2, 27, 9, 30); LocalDate Time time3 LocalDateTime.of(2019, 2,27,10, 0) LocalDateTime time4 = Local DateTimeof(2019, 2, 27, 8, 30); LocalDateTime time5 LocalDateTime.of(2019, 2, 27, 9, 0); LocalDateTime time6 LocalDateTime.of(2019, 2, 27,7, 0); LocalDateTime time7 = LocalDateTimeof(2019, 2, 27, 7, 30); Event event1 = new Event(time6, time5, "WLH2005"); Event event2 new Event(time4, time3, "YORK2622"); Event event3 new Event(time1, time2, "PCYNH109") Event event4 new Event(time7, time4, "EBU3B3206"); 1 point event event2 event3 event4