PL$/$pgSQL is a block$-$structured language. The complete text of a function body must be a block. A block is defined as:

$[<<$ label $>>]$

$[$ DECLARE

declarations $]$

BEGIN

statements

END $[$ label $]$;

When do you require the optional label inside angle brackets $($or guillets $-$ double chevrons $[<<>>])$ in a PL$/$pgSQL program $($more than one answer possible$)??$

Group of answer choices

Always

When you want to identify the block for use in an EXIT statement

When you want to qualify the block for variable use

Only when you want to qualify the block for variable use in a DO$-$block

Never