Which code statements would create a new folder (assuming valid objects and variables)?

Which code statements would create a new folder (assuming valid objects and variables)?

A.
IDfFolder folder = (IDfFolder)session.newObject(“dm_folder”);
folder.setFolderName( objectName );
folder.link(filePath );
folder.save();

B.
IDfFolder folder = (IDfFolder)session.newObject(“dm_folder”);
folder.save();

C.
IDfFolder folder = (IDfFolder)session.newObject(“dm_folder”);
folder.setObjectName( objectName );
folder.link(filePath );

D.
IDfFolder folder = (IDfFolder)session.newObject(“dm_folder”);
folder.setObjectName( objectName );
folder.save();