SQL Views Are Always Updatable When ________

Multiple Choice

SQL views are always updatable when ________.

A) the view is based on a single table with no computed columns,and all non-null columns are present in the view
B) the view is based on any number of tables,with or without computed columns,and the INSTEAD OF trigger is defined for the view
C) the view is based on multiple tables,the update is being done on the most subordinate table,and the rows of that table can be uniquely identified
D) A and B
E) A,B,and C