1 Which of the following is incorrect variable declaration in PL/SQL? * (2 Points) O X_text number(10):=1234; X_number varchar2(10):='HELLO YOU'; X_text varchar2(10):='HELLO WORLD!!!'; X number varchar2(10): 3 Which column accepts multiple NULL values? (1.5 Points) Check column Foreign Key column Primary key column Unique Key column Not null column