marywouldliketodisplayacollapsedsectiononhervideocatalogform,shehascreatedasectionbuywhenshedisplaytheformintheclientthesectionalwaysopensexpanded.which oneofthefollowingshouldmarydotocollapsethesection?（）

A.nothing.Sectionsalwaysopenexpanded

B.modifythesectiondefaultpropertiestocollapsed

C.modifytheformpropentiestodisplayallsectionscollapsed

D.modifythesectionopenedforreadingpropertytoauto-collapse