Choose the correct statement from the following options. | PL SQL

A.    V_sample    Boolean := 'TRUE';
B.    V_sample    Boolean := 'true';
C.    V_sample    Boolean := TRUE;
D.    V_sample    Boolean;
 Both C and D options are correct; whereas, the A and B options are both wrong, as any variable assigned a value within single quotes is a character string declaration. Boolean variable can only take TRUE, FALSE, or NULL values.