Which of the following is not true about a schema diagram?

$1)$each table in the db is represented by a single box in the schema diagram

$2)$the name of the table mut be listed first inside its box and must be separeted by a line from the names of the attributes of the table

$3)$primay key must be listed before the names of other attributes

$4)$Lines showing foreign key constrains must be drawn where each line

originates at a primary key attribute and ends with an arrow head pointing at the corresponding foreign key attribute