In which of the following sections of a PL/SQL block is a user-defined exception raised?

Question

Hi,
A (somewhat elementary) question:
In which of the following sections of a PL/SQL block is a user-defined exception raised?
a) Exception section
b) Declarative section
c) Error handling section
d) Executable section
I'd be interested to hear people's answers.
Thanks.

Answer 1

As Etbin already noted, there are only 3 sections and user-defined exception can be raised in any of them. User-defined exception raised in declarative section example:
declare
    year_zero exception;
    pragma exception_init(year_zero,-01841);
begin
    declare
        v_dt date := to_date(1721420,'j');
    begin
        null;
    end;
  exception
    when year_zero
      then
        dbms_output.put_line('Year 0!');
end;
Year 0!
PL/SQL procedure successfully completed.
SQL>
User-defined exception raised in executable section example:
declare
    year_zero exception;
    pragma exception_init(year_zero,-01841);
    v_dt date;
begin
    v_dt := to_date(1721420,'j');
  exception
    when year_zero
      then
        dbms_output.put_line('Year 0!');
end;
Year 0!
PL/SQL procedure successfully completed.
SQL>
User-defined exception raised in exception handling section example:
declare
    year_zero exception;
    pragma exception_init(year_zero,-01841);
    v_dt date;
begin
    declare
        v_num number;
    begin
        v_num := 1 / 0;
      exception
        when others
          then
            v_dt := to_date(1721420,'j');
    end;
  exception
    when year_zero
      then
        dbms_output.put_line('Year 0!');
end;
Year 0!
PL/SQL procedure successfully completed.
SQL>
SY.