Which of the following statements is TRUE about preschool schedules?

a. Students who are unable to nap during rest time should be allowed to play quietly
b. Morning meeting should be about 30 minutes long
c. Challenging activities should be offered in the afternoon after rest time, rather than in the morning
d. Families should leave as soon as they have been able to communicate critical information to the teacher, as having too many parents in the room can congest traffic and distract teachers from supervision