Which four are valid Oracle constraint types?

Which four are valid Oracle constraint types? (Choose four.)

A.
CASCADE

B.
UNIQUE

C.
NONUNIQUE

D.
CHECK

E.
PRIMARY KEY

F.
CONSTANT

G.
NOT NULL

Explanation:
Oracle constraint type is Not Null, Check, Primary Key, Foreign Key and Unique
Incorrect answer:
AIs not Oracle constraint
CIs not Oracle constraint
FIs not Oracle constraint