513.Regarding the 'school zone start' sign installed on roads, what is its primary legal and regulatoryfunction?
(A) To indicate that the road section is the main route for students traveling to and from school,reminding drivers to slow down.
(B) To indicate that no vehicles are permitted to enter the road section;only school buses and faculty/staff vehicles may pass.
(C) To indicate that the road section is privateland, accessible only to the school's teachers and students during specific hours.

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