True-false item, and please explain your answer and fix the false option.

(A) A view in SQL terminology is a single table that is derived from other base tables or previously defined views.

(B) A view is supposed to be always up-to-date; if we modify the tuples in the base tables on which the view is defined, the view must automatically reflect these changes.

(C) A view is usally realized or materialized at the time of view definition.

(D) Views defined on multiple tables using joins are generally not updatable.